I'd recommend: based on intel x38 or x48, core 2 quad @2.66 Ghz, 2x1Gb DDR3 (or 4x1Gb), 2xGeForce 8800 GT 512 Mb. that should allow you to play assasin's creed, mass effect (when released) and other next-gen stuff without major troubles. and in perspective you can always upgrade your videocard
