[Water Warrior 2]

Sounds like the GZ is the best bike for you right now. Here's why !! It won't try to kill you like a faster heavier bike. You have had one riding course and that is a good start. Now do us and yourself a really big favor and buy the following book. "Proficient Motorcycling" by David Hough. It is the one and only Bible of bike riding. Read and practice the lessons and you will find cornering and parking lots a lot safer and your skill level will take an upward curve towards the sky. We don't want to hear about you getting hurt out there and the book is just chalk full of info and examples as to why a bike does certain things that may not make sense on occasion. I read it and the 2nd book for more info. Also had a 30 hour riding course to build my skill level. That was after riding for 50 years without a mishap. Bikes are really foolproof once you know the do's and don't's.
Ride for at least a full season before upgrading. Learn what the GZ will do without complaint and still remain reliable. Probably the best 250 out there.