The most important voltages for me were ICH and NB when testing at high FSB MHz.

fsb 1.4
nb 1.55
sb 1.6
ich 1.215

The NB cooler on the P5B Deluxe works excellent. I had to remove mine and straighten out the heat pipe a little so it made good contact. It works far better than the one on the DS3 so don't be afraid to give the NB some extra voltage.