I would definitely go with a Beretta Silver Pigeon I, or a Browning 725. The Browning 725 Field, with 28" barrels, (which is the shortest barrel length you should pick for modern skeet), makes a good dual field/skeet gun. For more serious skeet shooting, I'd cl with a Sporting model with 30" or 32" barrels.
The Sporting Clays club I shot at yesterday had a georgeous SPI in 20 gauge with 30" barrels for $1950 ($1850 member price).
I don't know if you've tried the 20 gauge, but I love them for skeet, and that SPI/30" 20 gauge is a gum I highly recommend.
A guy that shoots in my skeet league just bought 2 old Superposed guns with 26" barrels for him and his sons. Why, I don't know. They own a manufacturing company and seem to be well off. They didn't ask my opinion before buying them, so all I said was "nice guns". And tbey are. But not the beat choice by far. I think they took some advice from one of the old "regulars" that is slightly eccentric.
Don't get me wrong, the Suprrposed is a great gun and would be nice to have. But if you can afford $1900, there are a lot better choices for the modern game if pre-mounted skeet and of course, Sporting Clays which you will want to shoot a lot once you try it!