I'm personally not that big of a fan. I love me some powerful fans!!! I currently have three Scythe Ultra Kaze 3000 RPM running full blast 24/7. This summer when I make my radiator case and re-do my entire rig I plan on getting at least 6 more and I'm leaning towards having them on a fan controller but leaving them full blast. I love the sound and love putting my hand right where they exhaust
back to the OP if you are going for silence they truly are some of the best fans you can get and they perfectly balance sound and power. the only bad thing is that you can't find them very often :/ I personally would love to see a 3000 RPM version but the price would be near $30 per fan (Ultra Kazes are only $10).