I'm looking for my firts wrangler to. I'll tell you Aaron, from the looking I've done, it looks like you definately can find something in your price range. I would say probibably a YJ or an older TJ with >200k on it.
Also, my brother-in-law(who is a total jeep nerd) says that the 4 cyl's are pretty gutless. Do your reserch. good luck and don't buy the one I want