Replying to High Society FR the ski for me?

I'm 16 years old,160 pounds, and 5'11''. Skiing Midwest terrain but do go out west quite often. Advanced level III skier who loves to ride the park, 85% rails 15% jumps, but do love to venture to some trees and some casual pow. Want a fun buttery ski that will kill it in the park but will be able to take me anywhere. I have armada halos in 176 but would love a longer ski. Which leads me to question if I would get the 178 or 185?