I was very impressed at the type of 92mm fan featured in the back of the PowerEdge servers. It was a Delta 92x92x38mm, and had 3 blades. People said it was loud, but one guy replaced it with an ordinary thermally-controlled fan and it worked just fine without overheating. Now, if that Delta had thermal control, it might have been cool, because with only 3 blades at 1400rpm or so, that thing would have been dead silent. But those things usually go in server rooms.
One thing you can do if you crave quiet is put your stuff in a Directron Dragon 601 case which is made by Chieftec. It looks just like the famed Antec SX1040 and is available in black or gray. Just get that and an Antec TruePower power supply and a Vantec Stealth to go in the front hard drive bay, and your case will be very quiet, and still move enough air to get the heat out. Or you could use one of those quiet NMBs in front. Then use a Zalman Flower cooler with the 92mm fan, or the stock HSF. You will have a big silent case and a clear conscience (not locking your components up in an oven).