I recently put together a new water cooling loop for my E6600 and the temp drop and noise level is not enough for me to justify the $260 price tag. (I got an idle temp of 28c with this set).
It consists of:
Aquaxtreme MP-05 (says Aquaxtreme on the block, but was purchased as a D-Tek block (both make the same block): rivals the Swiftech Storm $72 (retails for $75)
Swiftech MCP655 pump (amazing flow and quiet) $69 (retails for around $75-80)
Swiftech MCRES Micro reservoir $15.99 (retails for $19.99)
Black Ice Stealth 120 Radiator $42.50
4 feet of uncut Clearflex 60 1/2" ID (5/8" OD) tubing (and 6 feet roughly of pre-cut tubing to fit my case) $7.50
4 feet of unused Coolsleeves (5/8" OD) (2 feet of cut Coolsleaves to fit my system) $7
10 Black Tube Clamps (5/8" OD) $7.50
PrimoChill Ice (Green) about half a bottle $19.99
Altogther it cost me around $240 plus shipping, when it could have cost me around $260.
The set was put together and used to turn on the computer for 1 DAY and 1 DAY ONLY. Right now it is just sitting on the floor, waiting to be disassembled and set off to an owner that actually needs the awesome set for a hot cpu!
If I cannot resell this stuff here, I guess I will just auction it off on ebay. I am willing to here any offers, and am willing to bargain.
My temps before the water cooling were 49 idle, and that's why I got the water cooling. However, I had my motherboard outside of my case and I tried to mount the stock cooler again and realized that I had originally not mounted it flush against the cpu. When I turned on the computer I was getting 36 idle. I was quite angry, because this water cooling set up seemed like a waste.
However, for someone like you who does a lot of overclocking, it seems like it would be a great buy.