I have an MCP350 and not only is it extremely quiet, but it's been nothing but reliable. I'd hold off on buying a CSP-MAG, as the original CSP pump and some reliability issues. Or inherent design flaws, depending upon who you ask. Then again, an Eheim 1046 is very quiet (quieter than an MCP350 even) and very reliable. If you can live with 1-2C higher temps in your quest for silence, that'd be the way I'd go.
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