Here is information regarding PSU's..
This is the tier system information which you should consider when buying a PSU:
This list looks at the main and critical sectors of a Power Supply Unit -
Components - Higher quality components means more stable functionality, thus longer life on power supply and components of PC. Low quality components can affect the life of the unit and all components of your PC.
Stability - A power supply that can output it's wattage and ampere current at a stable temperature and beyond or below capable with minimal ripple and without shutting down shows that the unit is more than capable of powering any PC within it's labelled wattage. A power supply that can't must be avoided.
Efficiency - Although not really relevant to the quality or the stability of any power supply, but it can contribute to saving money on energy bills and can even be close to virtually silent. Perform research on your desired PSU to see if it can reach its labelled efficiency rating. Link above for more information.
Safety - A power supply must be capable of working without short circuiting or causing any serious harm to you or others around you if it fails. Perform critical research on your desired PSU to make sure it is safe to use with all safety switches, such as over-temperature protection included. Stay away from units with close to no safety switches at all, for the safety of you and others around you.
All PSUs will be colored in co-ordination of the Ecova 80+ efficiency ratings (true efficiency only) below -
Standard
Bronze
Silver
Gold
Platinum
Titanium
Again, all PSUs are researched by reading professional, unbiased reviews with the correct testing equipment. Some units won't be returning, due to discontinuation and / or too old.
List updated - March 19th 2015
Tier One
The highest quality and most stable Power Supply Units available. Protected by industrial grade protection circuitry and can output wattage at a rated maximum temperature of 50°C or below. These units are also Haswell certified, meaning they can cope with the C6 and C7 sleep states of 0.05Amps without triggering the under-current protection switch. May even go over labelled wattage and still work until it safely shuts down.
Antec High Current Pro Platinum Delta Electronics
Be Quiet Dark Power Pro P10 / 850w FSP (550w - 750w) / Seasonic (850w - 1200w)
Corsair
AX / AXi series 760w - 1200w Seasonic (AX) / Flextronics (AXi)
AX1500i Flextronics
HXi Channel Well Technology
Cooler Master V series / V series 1200w Seasonic
EVGA SuperNova G2 / P2 / T2 Super Flower
Firepower Silencer MK3 1200w Super Flower
FSP Aurum PT FSP
LEPA G1600 Enermax
Seasonic
Platinum series Seasonic
Snow Silent 1050w Seasonic
X series / X series XM2 Seasonic
Silverstone Nightjar Platinum 520w Seasonic
Super Flower
Leadex Gold / Platinum Super Flower
Golden King Super Flower
Golden Silent / 430w Super Flower
XFX
Pro series Black edition Seasonic
Pro series Black edition Limited Edition 1000w Seasonic
Pro series XXX / Semi-Modular Seasonic
XTS Fanless Seasonic
Tier Two
As above, just slightly lower quality. Still safe to use and are all stable for any PC of today's standards, including Haswell C Stepping certification and 100% Japanese Capacitors. It is rare to find a PSU here with Taiwanese Capacitors and perform very well here, but they are here just in case.
Andyson Platinum-R 1200 (Some Teapo caps on secondary side, but check out Jonnyguru's review for this unit). Andyson
Antec
EDGE Seasonic
Earthwatts / Earthwatts Platinum Delta Electronics
High Current Gamer Delta Electronics (Non-Modular) / Seasonic (Semi-Modular)
Truepower Classic Seasonic (Essentially a Non-Modular version of the EDGE series)
Azza Platinum Super Flower
Cooler Master VS Series Enhance
Enermax Platimax Enermax
EVGA
Supernova B2 Super Flower
Supernova GS 850 Seasonic
Firepower
Silencer MK III 400 500 600 / 750 850 Super Flower
ZX Great Wall
Fractal Design Edison M Seasonic
High Power / Sirfa Astro GD Sirfa
Rosewill
Capstone series Super Flower
Lightning series Super Flower
Silent Night 500 Watts Super Flower
Tachyon series Super Flower
Seasonic
G series / G series V2 Seasonic
M12-II EVO (fully modular) Seasonic
S12G (Think of 2011 - 2013 Seasonic G series) Seasonic
S12-II Seasonic
Silverpower
SP 460w Fully Modular Seasonic
SP Semi-modular Seasonic
Silverstone
Strider Gold Evolution Enhance
Strider Plus 750w 850w 1000w 600w Enhance
Super Flower Golden Green / Modular / HX series Super Flower
Sentey Golden Steel Power 850 Watts Super Flower
Thermaltake
Toughpower Gold 850M Enhance
Toughpower Grand Platinum 850w Enhance
Toughpower DPS Gold Channel Well Technology
XFX
TS 430w / 550w-SEW Seasonic
XTR series Seasonic
Tier Three
Some Haswell compatible, some not (maybe unconfirmed). Still safe to use and stable, just lower quality components. Some capacitors maybe Japanese, but can include the Taiwanese capacitors. Not really ideal in serious overclocking or super-high load situations, such as a Bitcoin mining rig or a high end gaming system.
Antec VP / VP w/P or F suffix Delta Electronics
Be Quiet
Power zone series 650 850 750 1000 FSP
Pure Power / Pure Power CM HEC Compucase
Straight power E9 FSP
Straight Power 10 FSP
Cooler Master
G Modular Channel Well Technology
GX II Enhance
Silent pro M2 / Gold / Platinum Enhance
Corsair
CS Great Wall
CX / CXM Channel Well Technology
RM Channel Well Technology (450w - 650w, 1000w) / Chicony (750w - 850w)
VS Channel Well Technology
Deepcool Quanta 750w 1000w 1200w Channel Well Technology
Enermax
naXn ADV 650 Watts Enermax
Revolution X't series Enermax
Triathlor / Triathlor FC series Enermax
EVGA
430W / 500W HEC Compucase
500B / 600B HEC Compucase
Supernova NEXB / NEXG 750 Watts FSP
Firepower
Fatal1ty 2012 1000w Gold Channel Well technology
ZT series Sirfa
FSP
Aurum 92+ FSP
Aurum Gold FSP
Aurum S FSP
Aurum Xilencer FSP
Fractal Design
Integra M series High Power / Sirfa
Newton R3 Series ATNG
InWin
Commander III InWin / Powerman
GreenMe series InWin / Powerman [/b]
Kingwin Powerforce 850w High Power / Sirfa
LEPA
G500 Enermax
Lepa G900 Enermax
NZXT Hale 90 V2 ATNG
Rosewill
Fortress Series ATNG
Hercules 1600 Watts High Power / Sirfa
Hive / Hive S series High Power / Sirfa
Photon 750w High Power / Sirfa
Silverstone Strider Essential 400w 500w 600w High Power / Sirfa
Thermaltake
London 550w Channel Well Technology
Toughpower1200M 1350M 1500M Channel Well Technology
Toughpower Gold 1200w Enhance
Toughpower XT 775M Channel Well Technology
Toughpower XT Gold series (Really confusing name, since they are rated Platinum) Channel Well Technology
Toughpower XT Platinum 1275w (Please don't confuse this one with the XT Gold line) Channel Well Technology
XigmatekMaverick S 500w Andyson
Xilence Performance A series HEC Compucase
Tier Four
No Japanese capacitors found. Only Taiwanese capacitors and may even include Chinese capacitors. Very basic safety circuits or even thin gauge wiring used. Not for gaming rigs or overclocking systems of any kind. Avoid unless your budget dictates your choice.
Aerocool
GT Series 500s 700s 1050s HEC Compucase / Andyson (1050S model only)
Integrator 600w HEC Compucase
Strike-X series 800w 1100w Andyson
Templarius Imperator series Channel Well Technology ( 550W, 650W) / Andyson (750W - 1150W)
Cooler Master Elite II 550w (technically a 500w unit, maybe a typo from design department) Unknown OEM. Possibly HEC Compucase
Firepower Fatal1ty 2013 High Power / Sirfa
FSP Raider series FSP
InWin Glacier ATNG
LEPA
MaxBron B1000M Yuelin
MX-F1 series (Trigger-happy Overcurrent protection and very poor quality capacitors) Channel Well Technology
NZXT
Hale82N 650w FSP
Hale82 V2 700w High Power / Sirfa
Raidmax Cobrapower 500w (Not to be confused with Akasa's Cobra series) Andyson
Thermaltake Smart / Smart M Channel Well Technology (M Suffix, 550P, 650P, 750P) / HEC Compucase (430P, 530P, 630P, 730P) / High Power (1000M, 1200M)
Tier Five
Avoid IMMEDIATELY. These units are highly unsafe to use. No such protections added, very thin gauge wiring used, false advertising and too much to list. Reference to a higher tiered unit for a better, money saving and a much safer unit. For your safety's sake, please don't order or pick one up for use in your system. These units are a potential fire hazard and could even kill you, let alone your system.
A-TOP technology
Apevia
Apex (SUPERCASE/ALLIED)
Artic / Ace (They're the same company)
Aspire (Turbocase)
ATADC
ATRIX
Broadway Com Corp
CIT
Coolmax
Deer
Diablotek
Dynapower
Dynex
Eagletech
Enlight
Evo labs
EZ-cool
Foxconn
G7
HEC / Compucase Orion
HEDY (should be WAAAYYY lower down than these units. They're that bad)
iBall
iStar computer co.
Jeantec
JPac
Just PC
Linkworld electronics
Logisys computer
Macron
MSi (just stick to their GPUs and motherboards)
NMEDIAPC
Norwood Micro/ CompUSA
Okia
Powercool
Powmax
Pulsepower
Q-tec
Rocketfish
SFC
Sharkoon
Shuttle
Skyhawk
Startech
Storm
Sumvision
Tesla
Ultra