$80,000 should get a very nice rig.
However, I would not judge price only for a rig.
Look at things like the frame. Does it have a good solid I-beam style or a sheet metal one.
Look at the cabinets. Are the pressed wood covered with paper or are they real wood.
Look and feel the carpet. Is it rough or is it smooth and soft. Do you want carpet all over or vinyl?
What is weight of rig? What are the tires rated as compared to max weight on sticker? How much cargo can you haul. Difference between dry weigh and max weight.