Want quiet? Check out this site:
<A HREF="http://www.quietpc.com/cpucooling.php" target="_new">http://www.quietpc.com/cpucooling.php</A>
Want performance, with 100% ease of installation? I suggest the Swiftech MCX370-0A. Just a little loud, but not as much as a Delta. But, keeps it under 45°C. Get that one <A HREF="http://www.bzboyz.com/store/product471.html" target="_new">here</A> for $36.99. Or, at <A HREF="http://www.coolerguys.com/cpucool/extreme.shtml" target="_new">Coolerguys.com</A> with options of fans (or without one) starting at $29.95.
Or, get one that I think is between a quiet cooler and a Swiftech: the ThermalTake Volcano 6Cu. You can get that one <A HREF="http://www.coolerguys.com/cpucool/duron.shtml" target="_new">here</A>.
63.5°C is fine, unless your computer is locking up. But, everyone will recommend trying to get it below 50°C at the most.
<A HREF="http://www.anandtech.com/mysystemrig.html?rigid=13406" target="_new">My System Rig</A>