No idea what "going to a 156" means. Anyways, if it's height, consider Armada, Line, Faction and K2. They all have kid versions of their stuff i think. I know they're all mainstream companies but they really know their stuff, and they all have skis that can work in park, powder and on the slopes. Personally I've had very good experiences with K2 Bad Seed when i was younger, and Line Sick Day 95 (2014) and Armada JJ (2015). Line hold up very well on the slopes and on powder, Bad Seed are good on slopes and park but lack a little in powder, and Armada JJ are part of the deepest powder series so they really only work in powder.
Specify what 156 means and I may help you if this isn't what you're looking for.
Happy Skiing