I think that the 8800GT will give you virtually the same perf as the 8800GTX (plenty for WoW in either case) with less power drain and heat. It also only takes up a single slot.

I bought eVGA mobos and GPUs for my current comp, and I've been very happy with them. I tried to stick with stuff that follows the nVidia reference so that I can use their drivers. I have had bad expereinces in the past with smaller manufacturers that don't update their drivers after a year or so.

The 780i is compatable with the latest 45nm CPUs, which sound pretty killer. My 680i sadly is not...