Up the GPU as always most of us would say, you dont have a gpu in your list. Two 560 Ti's would be good if you can afford it how much are you willing to spend?
Something I also forgot to mention. xD When it comes out, I'm planning on buying a 7950 or 7970. I can crossfire it once I get enough money for another one. Until then, I can use the integrated graphics or take the 6770 out of my old machine and put it in the new one for a while.