r6 or cbr 600.

Grx 650 or Cbr650rr would be a good starter

This post was edited by Lazyakira on Sep 2 2017 01:22pm

PM me if you want serious advice.
I used to have a pure track bike and ran a motorcycle group of 150ish members for a few years.

brand new yamaha r3 is like 4500 out the door. plenty of power and very light.