The two best rated pumps out there (in the affordable range) are the MCP350/DDC (names from Swiftech and Dangerden respectively) and the MCP655/D5 (same companies).
Dave from C-Systems sells their Mag pump which is reputed to be very quiet and small. It is not a high flow pump, though, and falls below the MCP350/DDC in performance. It is much cheaper though.
MCP350/DDC - quiet. small. SHOULD be reliable, but I think there was an early batch that was problematic. Spendy.
MCP655/D5 - sorta quiet. You can set the pump speed with a 5-way switch built into the pump for the speed/noise tradeoff you want in your system. Can be very good performer at the expense of some noise, although not a lot of noise like a dishwasher. Even at top speed, it's not a huge amount of noise.
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