Replying to A Few Ouestions about Skis

So I am looking for skis for next season. My First question is which ski should I get? I really like the ninthward skis, would this be a good choice. I ski a lot of park probably 90 % because my mountain sucks and the only thing that is good is the park, but I really like to ski outside of the park when I go somewhere else which is like 5 times a season, so I want to know if the ninthward skis are a good choice. My second question is how long I should get my skis? I am 5’ 8” and about 130 pounds, but I should grow a little before next season. In the past I have skied shorter skis but I really like the ninthward mike d ski which is 176, or is this too big (if these are too big how would the 170 butterlicious be?). Also what are the benefits of having a longer/ shorter ski? Lastly I would like to know if someone can give me an estimate of how much it would cost for the 07 ninthward skis?