http://pcpartpicker.com/p/1ipfU
807$, it's the best i can do.
Technically you could cut corners, buy a GTX 660 for 50$ cheaper, lose 12% performance and get a cheaper motherboard but that's it.
Cutting corners might be worth it, I'm not quite sure.
It depends whether you want the most bang for your buck or not.
If you do, grab the GTX 660 and a cheaper motherboard.
http://pcpartpicker.com/p/1ipEr
Total : 687$
For 687$, it's a very nice machine.