[Jeff in Kentucky]

One of these supermotos below is a good first street bike for a taller rider, with more legroom than the 250cc and 500cc Ninjas. If you get bored with it later, you can add a bigger piston and some other go-fast parts, or buy something else.

The biggest negative is that the narrow seat is not the best for a passenger, or by yourself for long trips on the interstates at 75 mph. These are ideal for a former dirt bike rider- you will be very used to the handlebars and seating position:

http://www.topspeed.com/motorcycles/motorcycle-reviews/suzuki/2010-suzuki-dr-z400sm-ar66709.html