4000+ Brisbane @ 2.1
Corsair XMS2 2x1GB ddr2-800
ECS KA3 MVP V1.0A 580X CrossFire Mobo
2 3850's CrossFired
AFP 64 Pro
that ran me 500 shipped. so you can either change the mobo and video card for an nvidia setup, or you can keep it crossfired. you can then just add any dvd/cd player/burner and any hdd and you will be well below 800
also i plan on ocing the cpu, but if he isn't so keen on ocing then don't get the upgraded hsf and put some extra money into a better cpu.
also this isn't the mega knock 'em out killer gaming build, but it won't put a hole in your wallet and its a solid build imo.