Everything looks fine, except for the powersupply.
When buying a powersupply you dont nessesarily just look for raw voltage, you look more at how much 12v amps it has... voltage doesnt matter as much, 500w should be more than enough. (if you get a good brand)
Look at this one:
You can get something cheaper if you want, im just sayin you get WAY more for the buck with the thermaltake one i suggested
Btw that computer that you listed above will rock the **** outa WoW..