I'm sure for less than $50US we could find a truck heater-core and slap a few 6" Comair Rotron's on it, which would in all likelihood outdo Phaestus's proposed radiator setup.
Heatercore - $50
Comair Rotron Fans x 4 - $40
Laing D4 - $80
18v PSU to drive Laing D4 - $25
Tubing & Clamps - $10
Waterblock - uh what's the change there out of $380 US? $175 US left over? That should cover pretty much any block on the market you care to name.
Tweak the fans via their speed controls to meet the desired noise limitations...
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