ski_good_girI would suggest an all-mountain ski with a twin tip. Twin tips are important for progressing in the park and becoming a well-rounded skier, in my opinion. Unfortunately you're not going to find a ski that is made for both park and pow skiing. But there are skis in the "all-mountain" category that will work decently for most in-bound conditions including park, groomers, varied terrain and low-key powder. Ski suggestions that come to mind would be the Armada ARW 96, Line Pandora, ON3P Jessie 96, and Faction Prodigy.
Hope this helps!