PSU is overkill. TX750 is more than enough. Take the money you save and get one or two 5850's or a 5870.
The WD Greens are great drives for storage, but they are a little slow for a boot drive.
I've had bad experiences with off brand PSUs int he past so I'd figure I'd go for the big name-brand guns.
Also I've debated whether to get two video cards and crossfire/SLI, or just get one card. Which would be better for just straight gaming in most cases?