Those Vantec Tornados are 55 dB! As FrozenCPU says: "It is loud, very loud." I've got several of the 120 mm Vantec Stealth fans at 21 dB (and 53 CFM) and a number of Enermax fans with speed control. I get pretty decent cooling with them turned down a bit, and I can stand to be in the same room as the PC.
If you want to go with the Vantec Tornados, maybe check out CoolerGuys.com
since they're cheaper buy a few dollars. They appear to be cheaper than Frozen CPU on most of fans. I have bought a lot of fans and round drive cables there.