To be honest, I would keep the Intel HSF, when not doing heavy overclocking. However if you really want to invest some money into a quiet solution, what about the Coolermaster HSC-L71 Fujiyama. In this version it comes with a 2500rpm fan, which is very quiet and the performance lvl is a bit better, than the Intel stock cooler.
If you want to have better cooling at any point in time later, just grab yourself one of these nice new YS-tech TMP fans and replace the silent fan. From all the tests I did myself and read at overclockers.com the effectiveness of the HSF is still heavily dependant on the fan (of course it is not the only factor, the HS itself is also important, but the fan speed really makes a big difference).
Cheers
Speedy