Well, if your buying from Newegg, here's one looks nice:
http://www.newegg.com/Product/Produc...82E16817812002
Seems to be well reviewed (Mushkin makes some pretty nice stuff).
550W, good amperage on the 12V rail (even supports SLI).
Its modular so you just use the cables you need.
Note the rebate that puts it right in your price range.
Looks like it has a 5 year warranty.
Only thing you might not like is it has a green LED that might not go well if your case has all that blue light in it already.