nothing short of a custom water loop will beat a Megahalems or TRUE Rev C.
Truth be told I'm not a fan guy. Reading around says that for best results you'd be after a fan with high static pressure for heatsinks and rads, and the 120mm fans with more than 7 blades do just that.
People have used Scythe Kama, Scythe Junai, Akasa Apache, Gentle Typhoons, Yate Loons, etc., etc. Gelid WING 120 look good.
I guess it's a Google search and reading I'm afraid.