all depends on how much you intend to overclock.
I run a 2400xp with currently no overclock with a pretty cheap Taisol GCK760xxx, fan swapped to a only marginally better & quieter one, and usually sit at around 40/45C (idle/full load), and my mobo generally considered to overstate temps a little. window open and cool air coming in its sitting right now at 37C... If you intend to do a fair bit of overclocking though, run a really quiet fan or just have the cash, a SLK seems to get the vote.