It is more money than I would pay, but there are a ton of people out there that want nothing to do with the modern emissions equipment on current diesels, so anything before about 2007 demands a premium - especially if it is low miles.
If it came from Colorado, rust isn't likely. But do closely check anything that is chrome - bumpers, wheels, grille, door handles, etc. Colorado uses MagChloride to treat the roads, and it eats chrome.