Generally, the larger the fan the quieter it is because the fan can spin at a slower speed to move the same or more air so those with 135-140mm fans are even better depending on company.
If money is not a factor, my favorite power supply is the Kingwin Platinum 550W, that has a fan that only comes on under load, normally it's not spinning.
http://www.newegg.com/Product/Produc...82E16817121080
If money is not a factor, my favorite power supply is the Kingwin Platinum 550W, that has a fan that only comes on under load, normally it's not spinning.
http://www.newegg.com/Product/Produc...82E16817121080