Concerned about too tall for a Ninjette, but your avatar shows you riding a pocket bike. …in shorts !:o
+1 on take a rider training course, in fact the sooner the better, with dirt experience you are sure to have a better time.
Even if you are a great rider on that KTM and regardless of what street bike you select, riding the street is going to introduce you to a completely different riding style, skill set and experience. …I envy your newness
There is no doubt 250 Ninja is a terrific commuter bike, I know I’d love one and I already have a litre bike in my garage, but then I also want a 125 street bike if I can just get past the pain of insuring yet another motorcycle ! Would you be thrilled by the power of a bike like that? …coming off a KTM300 2-stroke, No. It’s a far heavier bike with roughly the same power as what you ride in the dirt now, minus several inches of suspension travel, seat height and wheel size. Still might be the perfect bike for one up street riding, depending on where you ride and your need for speed.
I’m not so sure on the dual-sport concept, considering you now ride a competitive Motocross bike. BTW what year & model is the KTM and where and how good can you ride it ?:i