What is the best water cooling kit on the market?

A friend of mine has a Asus Striker 2 Extreme motherboard, also the processor is a socket 775. He is looking for the best water cooling kit on the market, well the best "bang for the buck", something that will work for what he needs, but not cost an arm and a leg.

Here you can see a nice review for your case: http://www.overclock3d.net/reviews.php?type=3&id=69&page=1&desc=battle_of_the_water_cooling_kits