Here is one for £500 or $800
CPU - AMD Phenom II x4 955 - A great quad core, BE makes overclocking easy, plus great price/performance £93
Case - Easy Antec 300 fits all ATX mobos good air flow and is pretty much is THE standard in gaming cases £50
Motherboard - ASUS M4A78LT-M LE - Had this motherboard myself decent and at a low price £40
GPU - Either a HD5770 or GTX260 both are impressive have the 5770 myself at a decent resolution you can max any game £80 - £100
Memory - Any 4GB DDR3 memory will do RAM is so cheap... Corsair, Kingston and G-skill will do £40 or less
Power Supply - Very important to get a good manufacture (OCZ, Corsair, Antec and Coolermaster) 500w is more than enough £60 or less
Drives - 1TB HDD and of course a optical drive will finish it off - Cheapest I found was £50
OS - Pirate it you fucking n00b
Total £433 not bad considering a ps3 is 250
Similar to what I had before this is more than enough..
Fin