2 skis come to mind when I read this thread:
1) Moment Rocker - Mid-Fat rockered park skis. They kill it in the park but are wide enough to use in the pow or all mountain. And the rocker improves the butteryness and playfulness of them in the park. I've heard nothing but great things about this ski.
2) Line Elizabeth - This ski can be very different depending how the riders size. For Eric Pollard (who designed the ski) who is about 6'1" I believe, they are a fat park ski with tons of butteryness and playfulness. For someone who is shorter (like myself at 5'8") the Elizabeth is an all-mountain killer that is still super fun in the park.
I'd go with the Elizabeth. Super fun ski.