The ski would be used only on groomer days for a change of pace. But I would like a little versatility so that I can go ski the T-Bar a Breck if the whim strikes me.
If you get a ski that is really purpose built for carving firm snow, you probably won't have this desire. Where does this "whim" come from? Is this to avoid crowds or because you ski with others that would get bored of groomers? A good narrow ski will make you view conditions very differently. You will actually seek out the most scraped off areas of the mountain. Soft snow will be boring to ski by comparison.