Replying to New Stick sizing/mounting

So I was looking at getting some alpha ones, and pretty much have my heart set on them. They will be for riding park only. I'm am 5'9" and 175 lbs, type 3 skier who will be doing mostly jumps (locked corks, looking at getting into more advanced stuff), but I want to get better at rails as well.

My first question is should I be getting the 182's or 176's? I was leaning towards the 182. Second, will the skis flex pattern mesh well with a true center mount or not? Thanks NS.