One of the most sought after (for water coolers) yet least available is the NCore direct die Intel water block.
This requires a delid of the CPU doing away with the lid, there is an option to have the delid tool which doubles up as an extra CPU clamp.
It was a Kickstarter over a year ago that had multiple chronic disasters yet the guy is determined to get them to those who didnt ask for a refund.
He recently built his own very high precision CNC machine to complete the job himself, our water blocks should be manufactured soon.
After the Kickstarter has been fulfilled it will no doubt go on general sale so is perhaps worth reviewing at some point.
As long as the CPU can be delidded its worth considering.
Ncore is a waterblock designed for Naked Die Cooling with an integrated IHS, unique "in socket" mounting and adjustable waterflow.
www.kickstarter.com