Just to get an idea of what prices are out there and floorplans, check out this PPL consignment place. You will see there's a 2001 37' Newmar Dutch Star for $20,000 and others below that. If you click on the diesel section you'll also see that diesels cost more.
http://www.pplmotorhomes.com/classa/class-a-motorhomes.phpIf you have a vehicle already that can be towed 4-down that would be your best bet. It's so much easier and convenient not to have to bother with a car dolly and where to store it on the campsite.
Good luck! There's one out there for you....
