[manofthem]

Corsair is a good choice, currently running a 1000HX myself for almost 2 years running dual cards and overclocks everywhere, and its been delightful in all aspects.

For motherboard, do you have any company preference or any color theme preference?

That Rampage IV is pretty beast with tons of features, you could run 4 way gpus FTW, and since you're going all out with this build, why not top it off with that mobo (hopefully it matches your color theme).