I don't know about the Sedra pump but the Genx 4100 that came with my Euro-reef RS180 sounded like a train in my living room. Had to spend another $125 to upgrade to their Eheim 1262.
Of the ones that you have listed I like the ETSS evolution 500 the best. For around the same in cost (assuming new) I would get a DAS EX-2 from protein-skimmer.com for around $400, a much better unit.
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