Nice read, and not half bad system. If it was my money, and this is just my opinion, and that budget range ($600-800 lets say, which is where most people like to be) I would go with this setup instead. Keep his case, powersupply, RAM, harddrive and video card as they are fairly solid recommendations that would be hard to beat. I would nitpick the HDD and go Western Digital for $8, but thats minor. Now, go with this MOBO and processor:
Intel Core i5-750 Lynnfield 2.66GHz - $199.99
GIGABYTE GA-P55M-UD2 LGA 1156 - $109.99
Your only spending $80 more, and will have a system that supports the latest Intel socket and a quad core CPU to boot. Plus, every benchmark and review I've read shows the i5 outperforming even a Phenom II X4 965 BE in some cases (see
http://www.anandtech.com/cpuchipsets/sh ... =3634&p=20 ). Granted you lose crossfire with that paticular setup, but we're talking budget system here. The Intel setup is a better "bang for your buck." Again, just my 2 cents for what its worth.

Silverstone Raven RV01
Windows 7 Ultimate | Intel I7-D0 @ 3.8ghz (TRUEBlack) | EVGA 760 Classified
Corsair Dominator 6GB | EVGA GTX 480 SC| 300GB Velociraptor
Logitech G500 | Nostromo N52te