Replying to AR7 vs Suspect vs THall

I'm thinking about getting one of these three skis. I'm 5'-1" and 106 lb. I'm looking for a ski that has enough edge armor for rails and is also good on the whole mountain. Im located in the midwest and I end up skiing either icy or slushy slopes (although I am planning to go out west at least twice). Im pretty new to freestyle, so I'm still learning the basics. Also what size would be right for me. I know that your generally supposed to size to your head but i saw a few people that sized to their nose.