I've been using a Titan aluminum-framed fan on the Coolermaster HHC-001 I have for about a year. This fan is 38CFM, but is very quiet for the amount of air it pushes - about 30dB. It's got RPM monitoring, and has been extremely reliable. I believe I got it from PCMods.
This system (presently an Epox 8K5A2 with a 1700A T-Bred) is soon to be upgraded to an 8RDA+/1700B T-Bred, and the HS will be replaced with a Thermalright SK-7. The aluminum fan will have to be replaced due to the size of the frame. (Won't fit the SK-7). I'll use it as an exhaust fan in the case (Lian-Li PC-65b), and replace it with a Panaflo 80MM H1A.
It'll look good in the exhaust position!