The Zalman 9500 is good, but it's neither the best, nor the quietest, nor the cheapest. I know, I have one. I had to mod it to make it quiet. It also doesn't cool as well as other tower-style HSF's....like the Scythe Ninja or Tuniq Tower. They'll both spank the Zalman back into the Stone Age, and for less money too. It looks good, yes, but will CoreTemp or TAT look good when your CPU is running too hot? I didn't think so.
Ninja or Tuniq. Ninja for quieter, Tuniq for best air performance and both are cheaper than the Zalman.
Zalman, unfortunately *WAS* the name in cooling, but no longer. They're not even the 2nd or 3rd choice now for HSFs. VGA cooling, for sure. But not for CPUs anymore.