Jim: If you don't mind doing some (or most) of the interior work yourself for cabinets, table, stove and furnace install, you should cost out a shell model. We bought an ATC Ocelot in Nov. 2013 and total cost into it now is about $13K. We have a two burner stove, icebox, Propex Furnace, side dinette, Fantastic Fan, rear steps, Yakima racks, cabinets, etc. When I was looking for a camper I put together a spreadsheet and every time I ran the numbers on what a use camper would cost, then add in what we wanted (and having to think about taking some things out) was basically cost neutral to a new unit.
2005 Tundra 2013 Ocelot "Ridiculously comfortable"
2021 Tundra 2022 Cougar Shell Built Out "Even more ridiculously comfortable"