How often do you go? depending on how much you go and if there is a spending limit.
Since you are 150 pounds, you may be able to get away on a Supermodel X in 156, but I donnot reccomend it, also that you are 5'4".
For a powder, I would get the malolo, i wasnt impressed with the fish 150 last time I rode it.
Even though the custom X isnt really made for powder, it is a posotive profile board, and really made for fast groomers and not bigass powder, but look into the 152 in that anyways.