you left off the most important part for gaming a graphics card, thats a great build but the GPU will make it or break it, if you want to pwn SOW get a 5850 or 5870 and slap an after market cooler on your cpu, i recommend Prolimatech Megahalems
http://www.newegg.com/Product/Produc...82E16835242001 just make sure you have case clearance if not you can get something small cheaper
slap 1 or two 120mm fans on that thing and you can OC the 920 to 3.8-4.0 easy no problem, ive got mine at 4.2 and never goes over 75C max or you could leave the stock cooler and go for a mild 3.2 - 3.4 OC
to put anything less than a 5850 on that system would be seriously GPU bottle-necking the system