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I think that on paper Silenx's fans would take the cake. I don't have any experience with them though so they could of embellished their numbers. Should look into their products though.
I assume that you mean quiet performance fan. There are a number of fans that are quiet - because they don't push any air. My personal experience with SilenX is that they are very good quiet performers, both on paper and in the real world. You won't go wrong with them.