If it is AM2+ socket then hsfs that fit AM2+ will work. The OCZ Vendetta or Vendetta 2 would be good. Even the Cooler Master Hyper TX2 would probably be OK but I'm not sure if it fits the AM2+ (I doubt that the measurements of the socket are different from the regular AM2, just the pin layout or pin functions). Apparently that is correct as according to Wikipedia, the AM2+ processor will work in the AM2 socket mobo just the advanced features won't work.
.bh.