The BI Pros are a little better than the others, but even they start to choke unless they have about an 80CFM fan onthem. There's just no way to get them really quiet without noise; their facial (is that a word) area is just too small. You could I suppose use 2 BIs, but with neither one working at a very high efficiency I don't think you'll get the performance that you would like. You'll need a bigger pump then.
Oops Bignuts I meant Danner or Eheim or Laguna (pumps I have used and can vouch for). The Rio I had (180 I think) was a rattly lil ****er. I got it with a DTek res, and even after gluing the impeller it was noisier than my Danner 250.
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