I've never heard of Bay Hills before, but my Dad has been full-timing in a Big Horn for close to 7 years now. It's mostly parked these days, but he has pulled it all over the U.S. and Canada. He's had a couple of minor issues with it, but it's been good to him overall. I have heard a lot of good for the Sandpipers also.
From the sounds of it, you are really taking a big step up. Have you thought about the tow vehicle yet? You will get a ton of good advice here on that as well, especially as you start narrowing your choice of 5th wheel down. Most good advice will have you pick the camper first, then select a truck big/strong enough to pull it.
Good luck, and let us know if you have any other questions.