I got a 1200l/h Seltz pump thats pretty quiet indeed (as long as bubbles are out). Here is the exact reference:
Hydor Seltz L30 II
HMax 1.95m QMax 1200 l/h 27W
price tag around €55 or $60
It's a mag drive, and can work immersed or inline as well.
I found mine at a local aquarium shop.
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