Build your own…
Specs wise, for gaming the GFX card is far more important than the processor and amount of RAM as you probably know. With that in mind I’d look at a spec like the following for a cheap gaming machine, somewhere around £400 all in with ok bits…
Core i3-2100 processor and suitable motherboard
4GB RAM (any more is pointless for gaming really and costs money better spent elsewhere)
ATI 6770 GFX card… At about £80 probably best bang for buck GFX card around now and should play any game at a high frame rate with high resolution.
500W+ PSU to make sure it’s got enough juice…
Quad core processors, flash motherboards and loads of RAM are all wasted on gaming machines. Nice to have for other reasons, but if you’ve got money spare that you want to blow, buy a better GFX card such as a 6870 for another £50…
Or buy a PS3/XBOX and several games, and get out on your bike a bit more often too! 😉