I read this article recently and thought it might be a good idea to post it here for people who might want to know more on what makes a good water cooler, what the differences are, which models to get, or even "Air vs Water".
I personally prefer the Asutek models, as they have been in the water cooling business a very long time, and seem to have it down pat. Along with the models covered in the article, I can add to the list the Intel Liquid cooler, and the Antec Kuhler H20 920.
For those still on the fence about Air vs Water, I think the first paragraph of the article addresses that! Anandtech - Closing the Loop