The Coolermaster Igreen is OK. 33a on the 12v rail. Gets decent reviews. http://www.driverheaven.net/reviews/iGreen/conclusion.htm
If available, the Antec Earthwatts 500w is better quality, and is usually at a good price. After rebates, they are only $50 in the US.
You could always drop down to the 5000+ Black Edition processor. Performance is not much less, but the price is usually much better. Requires less power and creates less heat also at stock speed.