I've had good luck with the VANTEC AeroFlow, it's quite and cools fairly well. I replaced it with a SLK-900 because I was trying to get the last bit out of my overclock without going to water. Decided that I'm going to water anyway.
I've got a COOLERMASTER AERO 7+ also that I just put on the other day. The clip that comes with it holds the heatsink a bit loose. I've had two other people tell me theres are the same way. I replaced it with a clip off an older Thermaltake volcano 6 that I had, works like a champ now!