Check out this site
http://www.low-noise.de/web/Artikel/...nisse_kuehlung
The Innovatek Rev 3 made 1st place. It performs about 5°C better than the Maze 2 from Dangerden. It has alot of surface area inside, unlike the retail waterblock available in the US. But
www.highspeedpc.com happens to sell this block! I think I will be getting one in the future.