Mantras aren't much of a park ski. They are pretty wide (94 in the waist) and really stiff...the Volkl Karma is a good all mountain ski that also does well in the park.
Ar5's are a park specific, but if you want to ski more all mountain go with the ARV.
I think the buterlicious is a good park ski, but I don't really know. The name at least makes it sound like it would be a good park ski.
Check out public enemies for another ski that does well in the park and all over the mountain.