I think it would be best if you tell us what you want to do with your bike.
City traffic, highway, long trips, etc.?
I ride only in the city. I have a 150cc bike and the Duke 390 (2017).
With the 150 I am riding often full throttle. With the 390 seldom full throttle. It has a lot of power and I like it but for the city it is not really necessary.
Maybe a 250 is also an option for you. I never had one but just to mention it for the discussion.