I have a Phenom X4 965 and am running this cooler right now: http://www.newegg.com/Product/Product.aspx?Item=N82E16835233082
It's fairly quiet- definitely better than the horrible noise the stock cooler makes when the tiny fan spins up to 4000rpm- and it's MUCH more effective at cooling. The single fan was enough to keep me around 45c under stress tests. Overclocked, I added a second fan and still stay under 50c. For $20, it's hard to go wrong.