I don't care how nice it is, for a non-stock cb750 without at title I usually don't offer more than $1000. But that is me and NY is not fun to replace missing titles. IF he had a title I'd say that $1900 is a good price for the bike. Talk to the owner and see how hard it is to replace the title. As for a beginner bike it is all there and it runs and looks like it doesn't need anything, which is what you want. Don't worry it is still an old bike and there will be plenty to fix as you use it, but for now this is about how complete you want something.