Height, Weight, Ski Abbility, What You Want To Ski.
Go for Griffons on the JJ's, they have a wider toe piece which is nice for POW skis. I probably wouldn't go for Jesters you don't way that much and I would Imagine your not that much of an aggressive skier.
The Faction Kennedy is a really nice ski, I ride for Faction and the Kennedy park ski is amazing it has Medium flex and performs really well in the park they are a bit on the soft side and can get really playful. Get Kennedy's.
you're 14 and you're looking at 2g's in gear... Kids these days.... jeez.