A solid all mountain freeride board will be a great choice for you. You will want something that can charge on groomers and get you some float lines in the trees and bowls. While there are rocker boards that are designed purely for pow, that is not the norm. Full rocker boards are most typically freestyle oriented and not what you are after at the moment.
The Proto that you mentioned is a great choice. Camber Rocker Camber is an amazing option. On many boards it can offer you a great balance of float, easy control, bite and power.
Another awesome option is Rocker Camber Rocker (pop cam).
Stoked that you get to ride big Western Mountains. That makes choosing gear easy