Armada didnt change the sizes next year- 160-170-176-180 for the AR5s. I ride down here in the southeast and they only lenght i really ski is the 180 AR5- every now and then I will take out a t-hall or ar5 in a 176. I'm 5'9/10"
You would be fine on the 170 i think- Skis aren't really measured...