"Love powder" and "like...rails."
That is very broad spectrum for one board to cover. I have ridden a Custom a few times, and personally, I would not take it anywhere near the park, esp rails. FAR too stiff, IMHO, for that type of terrain. Best advice I could give you is figure out what your primary style of riding is going to be this year, and get a deck that leans a little more in that direction.