For myself (175 lbs), I like 50 on the skis, and 125 on the rear. However, I have a buddy around 280, and he likes his at 75 in the front, and 150 in the back. Its quite easy to tell if you like more or less PSI by the way it compresses when you ride. Start at a point, and if its too soft, add 5 lbs until its too stiff.
NOTE: Always remove the pressure from the shocks (tip sled on side) to get an accurate reading. It is also the best practice to do it outside with the shocks at riding temp. I usually ride for a few miles before making a change.
Another thing to remomber, when you unscrew the pump, you will lose about 5 lbs, so adjust this loss in you numbers.
DTR