I've tried a number of brands. But I like whisper.
I've had good luck with your basic tetra air pumps. They even sell them at walmart.
I've got half a dozen of these things. They seem to be a little loud right out of the box but after a few days you can barely tell they are on.
I have one in my living room, the bubbles from the air stone are louder than the pump.
I've also found they are louder if you put more back pressure on the pump. They seem quieter when running a single hose versus a gang valve. Alot of this has to do with getting a large enough pump.
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