Beginner Supersport 600ccm

Hello, I recently made my motorcycle driver’s license and have since driven motorcycles by friends. I want to get my own one now in winter after Christmas. So far I found the super sportsman class best and now I am looking for one. Unfortunately, I don’t know which brand / model I should choose. She should have good power (it has to drive 2 years with 48 hp but after that she should already have a good bang ) but also be quite robust so that she doesn’t stand ig money has to be put in. What can you advise me? Perhaps with link. What is the driving behaviour? With which KM stand should I fetch it if it should last 4 years? (drive about 2000 km per year) I am totally planless but I like the Ninja 600 J. PS: please no answers that a super athlete is nothing for a beginner ^^ I have already driven some, am also 22 and had no accident. Thanks in advance