iono guys hes pretty light for a all mountain 178 ar5. hes only 110 pounds on a 178 ar5 plus he does 50%park. that doesnt work bro. he needs like a 165 about maybe 144-166. not bigger. iono thats just my thoughts.
seriously just go with what you think you can handle. Longer is always better in many people opinions and I prefer long skis, but you are light weight so if you dont think you could tear it up with 176s, try 171 AR5s or less