you seriously think that ski is heavy? have you ever picked up a pair of regular carving skis? karmas are super light weight for what they are.
also, as many others have said, for what you are looking for, i think the PE in a 174 or 179 would be ideal. you could ski either size, but if you plan on mounting them forward of standard (and you should, at least +3cm forward), then get the 179. its a medium flexing ski that will still handle soft snow well, but kills it on groomers too. there are better park skis out there for sure, but for an all mtn ski that also skis the park well, the PE is a solid choice.