Depends on your budget, anton. If you can ditch out loads of moolah, go for the best air-cooling solution, the Swiftech MC462. However, if you are under a tight budget, the Golden Gate/OCZ Gladiator heatsink is a pretty good buy. All copper and kicks a**.
By the way, you can get the Golden Gate heatsink
here.. Think they are having a sale on the Golden Gate 40 now.