Go check out my post
http://www.computerforum.com/177543-amazing-setup-low-end-gaming.html
Went to a buddy of mine that works at Computer Deli and he advised that setup...
Mobo -
Heatsink for bio's ,
Crossfire , Up to
16gb of ram
CPU - AMD Athlon II x2 250 True Dual Core
Video - ATI Sapphire HD Radeon HD 5670 1gb
(Crossfire supported) (GDDR3)
Total around 280$ - Not including Ram, Liquid Cooling "optional", Case (Make sure has high air flow, cooler you keep your pc the better it runs), HD, ODD, PSU
No reason to go and spend 1200$ on a system imo and it be outdated within 3-5yrs when you could go and spend 500$ on a system and do the same thing enless your wanting to pull 100fps on high graphics settings in Massive Populated Multiplayer games.
But thats my opinon