You forgot RAM. 4gb is fine but it's not expensive so maybe pick up 8gb.
You may also need a DVD drive but they are not essential these days. They are dirt cheap though.
Also, you probably don't need a sound card as the onboard audio from the motherboard or the graphics card will do just fine. A sound card is worth considering if you use headphones (specifically surround headphones).
If you can budget for it, get an SSD as a boot drive. It's worth it.
Right, thanks a lot you two (bsmaff n jamz), really helpful.
So. I'm going to look for...
A small SSD drive (no need for more than 100gb really)to put the OS on. Using the other two HDDs I already have with music on and just keeping them in there to store things on.
Use the Pioneer 112 D DVD drive I already in this.
A decent graphics card to play all games on, I don't particularly care if I can't play them all on Ultra High in HD.
A mobo that is compatible with a good CPU - I'm not going to overclock it or anything like that, I don't know how/wouldn't need to do it. Also will get 8GB of RAM that will be compatible.
Then I need the case - again, what do I need to look for compatibility wise?
PSU - How much power will I need? Is this what makes the PC noisy? I'd probably pay a little extra to keep it quiet (as well as getting a good sound proof case).
I feel a lot more comfortable going to shop for these things now, I can't thank you guys enough.
When I've sorted the PSU/Case issue out, I'll get shopping round for the best deals!
PS - i've listed these for sale on AV forums - do you think I'm in the right price range?
http://www.avforums.com/forums/comp...r-graphics-card-motherboard.html#post17313396
Look forward to hearing from you guys again.