For nimble, smaller is better. I use to have a nice cb400T for riding in town. Easy to work on, but going to Denver on that bike from Colorado Springs was a bit much.

Not sure if you can find a BMW K75, but that would be a nice smaller bike that could still work well. BMW and cheap don't go together; however, that bike is a bit long in the tooth and on the used market you should be able to find a sweet ride under 5k, with more than a few hitting 2-3k.