i7-920/930? Would a 5850 make more sense? I'd like to go up on the CPU but I'm budget-constrained.
There is NO POINT in going above a i7 920/930. You can OC the i7 920/930 to about 3.6-4Ghz with good cooling.
I would also like to point out, unless your doing vid editing,etc you can save a bunch of money on a gaming build by going with an LGA1156 or AM3 build. For a gaming system, a decent X2/X3 with a good GPU will do quite well.