Re: $2500 Rig. Need some help.
I would just start with (1) 5870 instead of (2) 5850's. And then if you need it later get a 2nd 5870.
I would also strongly recommend the i7 920 over the i7 960, especially if your planning on overclocking.
I'm only home for lunch, when I get off of work I'll link you up to a few good heatsinks. and power supplies.