Hmm i'm thinking that you should go get a core 2 duo, cause you would be future proofing. My pick would be
Intel Core 2 Duo E6400
Gigabyte GA-965P-DS3P
Corsair Twi2X 1024mb or 2048mb 6400 Pro
A 8800GTS should be fine, Try get that one (forgot the brand name) Golden Sample, because it comes ready overclocked. That would be a mint system and it would be awsome to overclock.