I dont know about the BEST but have you gone to AMDs web site for recomdations....or try coolermaster....generally ball bearing fans are good....some say get a fan with a connection straight to the PSU, but the down side to that is if your mobo can monitors the fan speed then most mobo's only support monitoring with connections to the mobo its self. One thing I have never had a CPU fan connector fail on me and generally poeple going for PSU connector choose it over a mobo connection for that very reasion. )