Right, I want to get a new rig, and to cut costs I'll probably get most of the components myself.

I'll probably get something along these lines:

Q6600 Processor £168.25
2x1GB Corsair DDR2 675MHz RAM £54.00
Inno3D 8600GT 258MB 540MHz £67.38 (believe it or not, http://www.ebuyer.com/UK/product/126974)
Antec Basic 500W PSU £39.94

Altogether £304.32+mobo.

Now, I have no idea what mobo is good at all. Can someone link me to a good cheap one on ebuyer or something?

Is 500W enough?