Bob, I saw a great unit at the Milwaukee show this season. It's actually listed in the Polaris accessory catalog. I think it retails around $1700.00. I have two boys that will start riding with us in a year or two and this unit was neat...fully enclosed, front and side glass panels, cushioned seats with seatbelts available, and a lot of room inside, enough for an adult. Let me know if you find others that you like.
Jim