We bought an 07 Coachman 40 DP, with 53K miles for under $70K and love it. However you need to take into consideration that things may need replacing, or you want to upgrade to new and improved items especially if it's been lived in, or sat too long.
We were prepared for an additional $13K, we're at $20K. Tho we up graded things that most would live with. Wanted to add our personal touches.
Here's a breakdown, started with a new exhaust manifold, it runs great now!
New driver & passenger chairs, because the seat belts wouldn't retract, and they weren't comfy. New refrigerator, 2 new A/C's, new mattress, replaced plastic sinks with residential, faucets too.
I hated the bronze door pulls and light fixtures so I replaced them with brushed nickel and upgraded lights to LED's. Replaced the tired old AM/FM radio with an Alpine 3x7"screen with Apple play, can use our phones for GPS and tunes, upgraded the speakers too.
Then the inverter died and took the batteries with it so that was upgraded from 1200 watts to 2000 apparently they last about 7 years.
Sounds like a lot but we love this thing and are confident with all the systems now. My hubby calls it the SS for "She Shed" LOL
Good luck in your search, may you find one that fits most of your wants and needs, they're out there!