Replying to 2014 ICELANTIC DA' NOLLIE +K

I made my decision to purchase the 2014 Da' nollies, however I was wondering what length is perfect for me?

I have skied 176 punx which have slight rocker in the tip and tail and loved them. I also skied 172 k2 recoils that ski like 169's and found them fine.

I'm 5' 8" 135lbs and wondering if I should buy the 170 Da' nollies or the 180 Da' nollies?

I just don't want a ski that feels too small or a ski that feels to big. Wish they made them in a 175.

Any input would greatly be appreciated!