Off topic, since I've never heard an mcp350, but here's my 2 cents:
My 1048, mounted with 1/2" foam (a pan sponge) is inaudible outside of my (well damped) case. It's barely audible placing your ear up to it with the case open. Note that this is with a new impeller assembly. After 2 years of continuous running it developed a nasty rattle (shaft and impeller wear), but did not lose performance. The new impeller was 7 bucks, but another 7 to ship.....grrrrrr.
I briefly tried a D4 and it's whine was intolerable, even undervolted. When Cathar posted his findings on overall pump performance, taking into account the D4's heat dump to water, I went back to the 1048 and was much happier. The 1048 is pretty big though, and wiring for 110v is a bit of a pain.
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