stupid-devil, if quiet is what your after and you gotz the cash take a look at water cooling, especially for OC'ing. Not everyone is like me: I like everything between the white-noise of 120's....it's soothing, and the thunderous roar of Thermaltake A2029's...reminds of AH-10 Warthogs!
Items of interest to help quiet down an uruly case on air.
Silverstone FM121 fans
vibration dampening kits
cutting all "chassis grills" out - causes a "whooshing" sound.