Replying to Chronic

ok, so i already have invaders in 161 for my backyard, urban, and rails. i am 5'6 and 115 lbs. i want a ski that will perform well off of big jumps( 40+) and do well at all mountain. i'm pretty sure that i am going to buy the chronics, but I was wondering if i should spend any extra money on the new chronic. I think that they look sick but I don't know if there are any differences in construction compared to last years model. I ski in park city for a week every year. also, would the 171 be a good size?