laguna pond pump by hagen.
they have various models and they are the BASE pump for the RED DRAGON and ATB pumps and coralvue copied the design for their waterblaster/bubble blaster pump.
you can pick one up at most pond/general pet stores so you can test it out in fresh water then return it if you don't like. Its a submersible pump but i think you can run it external as well. Dirt cheap too. These pumps are actually quiet
BTW the reef flo pumps are not quiet - they are quiet in terms of other external pumps I guess. I dunno if you guys are spending your time at too many heavy metal concerts but your definition of quiet is different from mine. I run eheim return pumps and used high end computer fans to mod my light and cabinet so it was silent. All i can hear is the air intake on my swc skimmer (which everyone here says is silent but it isnt) and my vortechs (gentle hum in reefcrest)
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