Replying to Ar5 size questions

hey guys, so i've been skiing on 169s for a couple of years and i'm getting ar5's but i wanna know if i should get the 176. I'm 5'7, 145lbs and i'm more than capable of skiing, best trick is a rodeo 9( was planning on coming to the us open i'm from ny but i found out they're closed for pipe and park, sucks i shoulda check ns earlier and found out it fills quick.)Anyway, i'm just lookin for opinions/reassurance.. should i go for the 176 or 179?