The guys over at overclockers.com know their sh!t. Good reviews and if you have any questions, the people on their watercooling forums know ooodles more than most people here.
D-tek Customs is a good place to buy watercooling stuff from if you can get enough knowledge to know what parts you need. Innovatek makes some pretty decent kits. If you go with the buying separate parts and have any questions, just PM me or something...
Also, for what reasons are you considering watercooling? It's rather pricey... I believe I shelled out somewhere near 300 dollars for my entire setup. I made my setup for performance purposes so it's not super quiet. I could take a temp hit and drop the speed of the fan on the radiator and make it very quiet though. Make sure that watercooling is really something you want to go for and make sure your goals out of the purchase are attainable.