Depends on your budget. Pc power and cooling has a 470w version for about $83 shipped at newegg. It has a single 12v rail with 26 amps. It will work fine for you if you don't use sli or crossfire. I use a ttgi superflower 450w with massive 140mm fan and adjustable rpms. I would recommend it, but it's discontinued. I've also used fortron fsp. They have a blue storm II 500w with large fan in the same price range.
Seasonic S12 ATX 650W Power Supply is $160 shipped at Newegg. If you look around you will not find a finer PSU manufacturer than Seasonic. I have this PSU and can confirm that it delivers a new meaning to the phrase silent power supply. It is also very very efficient and has a reputation for being of the highest quality. I will probably reuse this PSU for my next build.