MOBO: GIGABYTE GA-990FXA-UD3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128514
CPU: AMD FX-4300 Vishera 3.8GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E16819113287
GPU: GIGABYTE GV-R797OC-3GD Radeon HD 7970
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125413
RAM: CORSAIR Dominator GT 12GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145329
I also bought a 1TB hard drive, Cooler Master HAF case, Cooler Master 700 Watt power supply, a new keyboard and mouse, and a new 25" LED monitor from HP. I already had one of the 25" LED monitors, so now I have a matching set sitting side by side.
You don't have to spend $3000 do build an awesome machine. My machine runs Crysis 3 with all of the graphics maxed out with absolutely no problems.