Flow is the key.
For $22, you can't beat a Via Aqua (stated flow of 370 gph). However, the Eheim 1250 is the "pump of choice". It's physically larger and pricier (almost 3x as much as the Aqua), but it has earned a loyal following among water cooling advocates due to it's durability, low noise, and flow characteristics. You could also try a Danner Mag 3. It's available for about $40, and is more powerful than eitherof the pumps I've already described.
Keep in mind that prepping your system for water cooling is a lot like prepping a car for the drag strip, where the following is always true:
"Speed costs money. How fast do you want to go?"
With the growing commoditization of water-cooling and wide availability of every component neeeded to build such a system, it is no longer necessary to jury rig your system. Do yourself a favor, and just buy a pump that is known to work well. It will save you buttloads of time and probably buttloads of money, and you'll spend a loty more time *using* your computer rather than working on it.
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