Autoparts/Hardware Store Water Cooling.
Personally I’d just use a variable D5 and draw off the bottom of the rad and let gravity and head pressure do most of the work through the rad tubes with the pump only pushing the water through the tubing and blocks on the MB/cpu to the inlet side of the rad.
Fans would be more important, trying to get even air flow across the fins due to the size of the rad will be difficult.
Having around a inch and half outlet is nice, if you constructed a manifold you could add pumps for different configurations at a later date, considering that the outlet is nine times larger in cross sectional area than half inch tubing, available water would not be a problem.
"You could take apart an old harddrive and use the motor to spin a mechanical waterpump from a car." Could try a 15K Cheeta.Edited by Aleslammer - 6/8/12 at 1:18pm