Paul,
A good place to start your search would be the Forum Classified section.
Spend time researching right here.
If your in a hurry...
I would advise as new as you can afford, doing things you want to is usually more fun than doing things you have to.
You can spend a lot of $$$, and time on a fixer upper. (well it worked the last time we used it)
If your a campground person, NP, DEC, Forest Service.. 25' to 28' is a good size.
RV parks..the sky's the limit.
Good luck in your search!!
Bob