Hey a Quebecois.
Don't listen to Megazord he probably doesn't realize that English is most likely your second language....
So I am guessing you are pretty young so I have to say why not a used ski because you could potentially grow out of your skis in half a season....It' s not a great idea to get a ski that is too big and just hope you grow into it because you will be unsatisfied and feel awkward until it fits. Not too mention you could destroy your brand new skis on the first rail you hit, because that is the way park ski goes sometimes...especially with newer, less experienced riders
However if you insist on getting a new park ski because money isn't an inssue let me suggest a symetrical ski you can center mount if you are concerned about spin weight. Blue Steels, T-halls and Liberty LTE are excellent lightweight park skis.
Good luck my friend....