I would skip the 90's 250 because I assume you are referring to a 2 stroke and their road manners are less than stellar. Plus based on the guys I ride with, I think there is some kind of unwritten rule that if you live in CO you have to ride a KTM.
Check out the Rockies section on
www.advrider.com if you haven't yet. Great bunch of guys who will bend over backwards to hook you up. There's even a pay it forward thread to help you outfit yourself with gear and whatnot on the cheap (i just scored two brand new pairs of atomic ski boots from there).