How are you going to use it? Full time, vacation, weekender, snow/sun bird? You also did not say if you wanted gas or diesel. I will assume diesel pusher if you are going from a fifth wheel to a motorhome.
The more time you spend in a motorhome the more CCCs you need and the heavier duty the systems should be.
For $80,000 you could get a Foretravel or Country Coach which are good to full time in. They have very heavy duty systems. Monaco and American Coach (owned by Fleetwood) are in the same approx category as Foretravel and Country Coach (now owned by Winnebago). I also really like some of the Bluebirds. And Beavers are a good brand that was bought by Monaco.
Medium grade motorhomes are Winnebago/Itasca, Newmar, Tiffen, and Fleetwood in the years you are looking. Many of the coaches from these makers will have back radiators instead of side ones like the better brands. (Not all models, but many.) Personally I would not want a motorhome with a back radiator, too hard to work on. Most of the first category will have aqua hot, really good insulation, bigger motors, more CCCs, basement storage roll out trays, really good cabinetry, solid countertops, and some of the first category will even come with a chassis made for the motorhome instead of a fire truck or delivery truck. And a few of the first category will have semi-monocoque chassis, which are far superior to just rail chassis and the house built on them.
But if you are going to vacation or snow/sun bird you can live with the not so heavy motorhomes which means the second category. Newmar, Tiffen, & Fleetwood, + Winny do make a few higher end coaches like the Dutch Star which are OK for full time. Tiffen has the Zephyr. And Fleetwood has the Revolution. Those are going to be OK to live in for a good part of the year.
If it were me spending the $80,000 I would look for an 03-04 Country Coach Intrigue, Magna, or Affinity. Likely you could only get the Intrigue for that amount, but those are just beautiful coaches. The absolute best materials were used in them and go down the road smoothly. If you can find a Foretravel in that price range that is just as good and made in TX where you are from.
RFCN2
Country Coach
Jeep Wrangler Unlimited