if you looking for good quiet fan Noctua 1300rpm fits the bill ,i own fiev of them but i found them to be overrated and well overprice ,if you looking for better fan than noctua for your rad i would suggest Scythe Gentle Typhoon 1800rpm(fan controller comes handy if you like thinks quiet) if you lucky to find them online; http://www.sidewindercomputers.com/scge120mmsic2.html
look for fans with good static pressure
my is lower FPI http://www.dangerden.com/store/tfc-x-changer-triple-radiator-360.html#tabs
you be fine with noctua's 1300 rpm is very comfortable i have them on XSPC RX240(8FPI)and EK-XT 240 but if you own fan controller get something around 1600-1800rpm
you be fine with noctua's 1300 rpm is very comfortable i have them on XSPC RX240(8FPI)and EK-XT 240 but if you own fan controller get something around 1600-1800rpm