Out of bikes that actually exist it would be the Kawasaki Z900-RS or Yamaha XSR-700. My next bike is probably going to be the new Kawasaki KLX-230 (dual sport version) so I can have something closer to the wife's VV in power.
I catch myself fantasizing about someone building a dual sport (under 420lbs.) with a 500-700cc P-Twin motor in it. A modern 500 cc thumper would be cool in a dual sport if it had a six speed tranny & a curb weight under 330lbs. something like a DRZ-500.
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