On my sisters 939 socket I picked up a 70mm-80mm adapter, then a 80mm-120mm adapter. Then I strapped on a stock xion 120mm fan from my case. With it being forced to a smaller size it gets some serious velocity, I believe the xion fans are like 25-28 cfm, but much much better and I picked up the adapters off ebay for like $5. The only problems with smaller fans is that they get whiny, the 120 isn't exactly quiet in this setup but at least it isn't whining.
Also most stock am2 coolers are 70mm not 80mm.