Well, I know I want a Wrangler, something in the 2005 range. Basically I'm just a street driver with occasional camping trips and simple off-roading. I see myself staying basically stock. I guess my biggest concern right off the top is engine size. I'll pull a utility trailer sometimes. I want enough muscle to do that and accelerate as needed, but I don't ned a total monster either.
Other than that... pardon my lack of proper terminology and model names, etc... I want two-door, hard top, a weather-resistant interior. That's all I can think of at the moment, but I'm sure people have other sugggestion of issues to consider.