Very nice specs you got there. Waiting for that Gigabyte here too. For 10 more dollars though, you can get an Active PFC type PSU:

Antec Modular 550W
Sunbeam 650W Modular

non-modular
OCZ 600w - modular version is 5 dollars more.
HEC 650w


Those are usually 90-240v types, are more efficient and will save you some come electric billings.

Good luck with the boss