While the 250cc singles are a hoot, they're really not set up for touring very well, especially comfort and seating. I'd love to take a slower-speed backroads tour on something like a CB175 or perhaps an upright version of the small Ninja. Something reasonable comfortable, but nimble, preferably a small/smooth twin rather than a buzzy single.
These days, when I tour on my DL650, I constantly shake my head and wonder why I need more. But I haven't sold my FJR.