At your weight, I would try to find the 150 or 153. How old are you and will you grow much? if so, the 153 will be fine, but it is mighty stiff for someone as light as you. I rode the 153 for a season @ 170 lbs and it was pretty damn stable at high speeds. I recommend the board, but if you are going to stay around that height and weight, I wouldnt go anywhere near the 157. You shoudn't have any issues in pow either. 390 Boss won't be too bad, but it doesn't match the stiffness of the board. That comes down more to personal preference with the bindings matching the board. I myself prefer the binding to be slighty stiffer than the board.
Last edited by Snowbeard; 03-17-2014 at 10:52 AM.