I am buy some line blends friday and i was wondering what size i should get. I am 15 years old 5'4 and a 132 pounds i am an advanced/expert skiier. My dad wants me to buy the 178 because i could spend more years riding them. (i have not had my growth spurt yet but that should come soon) I am planning to ski 70% all mountain and 30% park. I think the 171 would be better but i wanted your guys opinions.