If you want to drop a little more, go with the i7 960. That's what I just purchased, along with a radeon 5850, 6gig ram, asus p6t.
2008 Montego Blue E90 ll Custom K&N Dual Cone Intake ll Aluminum OEM Pedals ll 25% Tint ll M3 Spoiler
To Do (Cosmetic): Black Line lights, Lux 4.0 Angel Eyes, 19" CSL HyperBlack
To Do (Performance): Exhaust (still undecided which brand), SSTT, FMIC (unsure what type)