Rossi S3. Not too fat underfoot, but wide enough everywhere else so it floats in powder, as far as all mountain skis go.
And to the guy who said JJ's, poor recommendation (no disrespect), but my dad has those, and they are terrible on groomers, and if you're skiing it in the park, that is what you are on if you aren't on a feature, so no, not JJ's, but fantastic pow ski.