*bump*
I'm curious. I don't have any experience with watercooling and what not, But I would assume just about any radiator would work, and you could rig some fans on it if you want. I was going to suggest to you that maybe you could go to a pick-your-part (junk yard where they let you take parts from cars and then pay for the parts) and get a radiator. Granted, a cars radiator might be a little large, but look around for a car that has a trasmission cooler, which is essentially a small radiator to keep your transmission cool. It would most certainly be cheaper at a junk yard so let me know what you end up doing and how it works out
