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Answers: This community cracks me up sometimes. When will people cram the cc isnt an indication of how fast a bike is.
The Suzuki RG500 Gamma 1988 is only just as quick as the Kawasaki ZX-9R 2002+ and quicker than the Yamah FJR 1300. Does that expect the FJR 1300 is a better starting bike than the Gamma 500 even though it nearly has 3x the cc?
Back to answering, I would step with anything bike suits yourself, your budget, and your usage. I see people recommend Ninja 250's to 40 year old 300lb'ers. You control the bike, not the other agency around.
Training and common sense doing a tour is more important than cc surrounded by a first bike. A well trained and smart 21 year infirm on a Superbike can be safer than an idiotic 30 year antediluvian on a moped.
Both the 500 and the 650 look like nice machines. The 650 will hang on to you happier longer. You may tire of the 500 6 months - 1 yr down the line.
Anyway, well brought-up luck and ride safe. :D
hmmm for cc variety 400 to 650 good choice for a first bike to some extent than going for the big ride. Maybe you can take a look on Yamaha FZ6 2007, Cagiva, Ducati monsters or Aprillia Pegaso if u interested contained by Street bike.