i have tried my best to stealth one of my machines and al is great except i can now hear my hard drives!
i use a coolermaster fujiyama heatsink silent as anything! they make a similar one for amd systems an ennermax psu which has a knob on the back for turning the fans down silent! my case contains 6 80mm fans 2 front suckin, 2 back blowin, one side cooling the graphics card and one at the top. these babys run at 1000rpm and are almost silent they are made by SUPER FLOWER. If you want to quiet your machine down i wouldnt bother with the magic fleece i dont think it is all that good, though it is kinda cheap and if it didnt do anything, use it to dampen vibration from the underside of the case!
good luck¬