Effective cooling is a function of both the heatsink and the fan. Put a good all copper heat sink on there, and you can get by with one of the slower, quieter fans. I'm running a SK-6 like smp -- it came with a loud and fast delta fan, but I replaced it with a slower (like 3700rpm) fan, and now it's quiet and still cools well enough to get the job done.
WebDude😎