I can't go much cheaper without sacrificing quality in your build. I just put this together! Pretty solid if you ask mehttp://pcpartpicker.com/p/2uOOa
Wait...did you say you already had a graphics card? If you do, then just take off the GTX 660 i put on that build. If you already do, I can actually redo another build for you with that extra cash, if you want me to.