The Katana 600 is a wonderful Choice!!! Learn on it & then go for a gradual increase in Cubic Centimeters..... I had a lot of Big DirtBike experience before I started riding Street stuff -- went from 50, 175, 350, 360, 400,500, 600, 650, 900, 1100, 1200, 1340, 1450, to a 1300cc (My BUSA) -- some of that was up & down. Good Luck with the Katana!!!!
Safer than alot of others & not so agressive a position.
Horse