Lots of flexibility - but I've found that axial fans seem to work best in the range they were designed for. So if you are actually targeting low noise, it might be worthwhile trying the designed-to-spin-slowly fans first. Not as flexible, but a better noise/cooling tradeoff if you're looking for low noise.
I've tried various fans with the BIP rads - they're not restrictive at all and the 120mm fan mentioned will probably be just fine (particularly pulling through the rad) so long as there isn't a lot of resistance moving air through the case. I'd hesitated to answer this one before as I don't know the 80 rads at all. From web pictures they look to be as restrictive as the BIXs and you may have a problem - I dunno..
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