You'll get a lot of different opinions here, but you say you stick to park, do you ride switch? I know twin tip skis, not so much racer boi skis per say. But if you want something semi wide, that's an all mountain ripper that dips into park/pow. You have lots of options. Check out backcountry.com , they have a great online selection of what to look for and great prices if you wish to buy. But if I were you I'd look into the new K2 Kung Fujas, nice dimensions, has rocker, pretty much bombproof, and well priced. Or, The Line Blend, I was going to get this ski but I got something similar for cheaper. But this would be another amazing choice. One of the best all mountain freestyle skis out there I'd say, great flex, great dimensions, price, and of course material. I'd say have a look at both and see, those are my two choices for freestyle skis. They're a lot more forgiving then regular non-twin tip skis, so if that's what your looking for hopefully that helped. You can also pm if you'd like.
Edit: Rocker is basically early rise so you "float" ontop of the snow, like a surf board and if you do wish to get more into powder, and want a rockered ski, trust me, you will never ever go back.