Watercooling, I much prefer DIY sets, over the external built kits. If you really don't feel building 1 for yourself with huge radiators, strong pumps, and powerful waterblocks, then get a full external kit.
LOL DIY stands for Do It Yourself, meaning salvaging some parts and buying some others. You could check out frozencpu.com, sorry i don't live in the US so i don't know much online retailers, criticool.com also offers some great prices, but they're in canada.
I'm currently running an FX-53 based system. I value quiet along with my cool. I've been using a Thermaltake Silentboost K8 for about 3 months now. Cool, easy to install and quiet as a mouse pissin on cotton. At $30.00 delivered you can't go wrong.
If you don't stand for something, you'll fall for anything.