if you don't care about price, and you're not just some panaflo freak, you should try a sample of many different companies. by ethics, i wouldn't deal with silenx, as one of their CReps was faking praise on silentpcreview.com, but i would look into getting nexus, or any low speed yate loon fan. the YStechs are sorta hard to come by in some cases, but they've had good results. you also want to consider making sure that you have a fan controller that accepts 4 pin and 3 pin, instead of just relying on your motherboard. a program that slows fans down with a controller is speedfan, which is helpful if you're lazy. make sure your cabling is good before you invest in low noise fans, as with low noise = low rpm, which means less cfm. unless you're silenx :roll:. good luck.