@Amateur
Im not sure if there is a huge difference but I was looking into the Kawasaki 650 (not the 650r) and I really liked what it had to offer. I like the fact that it was still a twin so it had a more predicable power curve for new riders but offered that little extra boost in power from the ninja 400 that may just leave me wanting a little bit more. The only problem is the extra 2 grand bump over the ninja 400 that I just don't know if I can justify if I end up getting rid of the bike within the next few years for something different. This is all super hypothetical though which is the frustrating part for me because I don't even know what ill end up liking, who knows maybe the ninja 650 is the perfect amount of performance for me and I wont want to upgrade but I really have no idea... I've just got stop thinking about it so much and get something with 2 wheels and an engine just so I can find out for myself