BTW, I used the power supply calculator on Newegg and it gave me 473W, but they didn't include different versions of the Phenom II X4 even though there are 95W and 125W editions. I also used the Antec calculator which is much more thorough, it gave me 334W only choosing the core components.
With a single 5770 a Quality 450 watt PSU would be more then plenty, and to crossfire 5770's 550 to 600watts is more then enough for that as for a 5850 500 watts is plenty to run that. To leave yourself plenty of head room for overclocking and other expansions I'd say get a Quality 550 to 650 watt PSU.
Here are the official ATI recommended power supply requirements for the ATI Radeon HD 5770 and 5750 video cards:
450 watt or greater power supply with one 75 watt, 6-pin PCI Express® power connector recommended.
600 watt or greater power supply with two 75 watt, 6-pin PCI Express® connectors for ATI CrossFireX™ technology in dual mode.
The recommendations are for an entire pc system.
Corsair and Seasonic are two brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty.