For the ultimate quiet fans, I used 220V computer fans - but wired them with standard 110V power. That way, they run at 1/2 speed. They are still effective, but they never reach the speed that generates that "computer fan noise".
The only risk with this approach is that the bearing on the fan must be good, or the 110V won't kick start the fan. While I was warned about this when I purchased them, it has never happened to me.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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