Spivey, my advise is save a few bucks and buy a 5830 and a used overclockable Quad cpu. 425$ at most.
Sell your e8500 and 8800gt for about 150$
Thats 275$ out of pocket for double the framerates and a much better cpu for future games.
Thats what I did. In the past 2/3 months I went from a e5400 @ 3.6 with a 8800gt,e8400 @ 3.6, upgraded 8800gt to a 9800gtx+1gb, to a gtx 260. Then bought a quad core 9550 @ 3.6 and then traded my 125$ gtx 260 for a 5750 +40$ a few days ago to hold me over till I pick a faster gpu.
I got real good prices for all this stuff used. And sold it for at least what I paid for it.
Bottom line. A quad core and 5830 should be in your future. :]