Personally I would never go with a watercooling kit, I would only build it myself. Usually they are around the same-ish price and the when you build will outperform the one that you get from a box. I spent 200 on mine and I am currently running my mobile 2500 at 2.6ghz stable at about 40c idle and around 45-48c load (depends on how hot of a day it is) Mind you thats my processor running at 2.0v and I only have 1 120mm fan blowing air into my comp (still waiting for my other fans to arrive) so my airflow isnt great. I went with dangerden for the waterblocks, tygon tubing, 86' chevette heatercore and a ehiem 1250 pump (good head heigth and keeps the water running at a good pase) So its totally up to you but I would say making one your self will look better and perform better.