If you're looking to do a little water-cooling action in your computer, you might wanna head over to Tweaknews and take a look their review of the Next-Cool WaterCUBE GT3 Waterblock.

The unit looks good and is watertight. The clamp has a good design and should certainly be looked at by other waterblock manufacturers. With the noisereduction in mind water-cooling isn't half bad if you can stand the stress. "Is my pump still on ? Did I fasten the hoses correctly ?" Making sure you have all the parts is about 75% of your entire project