I need some advice as to what parts to buy for a build. The only game I want to be able to play is WoW, and I want to be able to run it on ultra settings with no lag. I don't care whether it's an Intel or AMD processor, I'll go with which ever one's the better price. My budget is about $500 to build the PC, pay for the OS, and get the keyboard mouse and headset. So it's a pretty tight budget.