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Eheim, Little Giant are known to be dead silent. heck even my Hydor L30 is less noisy than an idle HDD or a Papst fan.
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I've heard the exact opposite when it comes to Little Giants, judging by owners who use these in aquariums. Eheims aren't completely silent either, at least the one I had (1060).
One pump that hasn't been "introduced" into the WC arena yet is the Rainbow Lifegaurd "Quiet One." It's extremely high flow, but pretty poor performance under pressure (lol). Also transfers much heat into the water. Supposedly the quietest pump you can buy.
Also, check out the Iwaki pumps, perhaps an MD-20.