We have a 2001 model year DP purchased new in 2000.
It has over 100,000 miles all over 49 states (except Hawaii).
We full-timed for a number of years, and now only do six to nine months a year in the RV.
We have it serviced every year and have full records.
If I were looking for a motor home now, I wouldn't hesitate to buy ours.
However, IT IS NOT FOR SALE!
If we were to look for a used motorhome now, I would look at either PPL or Lazydays. I've dealt with both of them for parts and service, and am very convinced that they are competent and above board in the way they do business.
If you look at their websites, you can see what is available and at what cost. It will give you a good basis to assess what you might be able to get for what you want to spend.
EDIT: IMO look for Diesels, not gas, and get something old enough that you don't have to deal with the DEF stuff.
of course, YMMV