I can touch on a 9.5 foot rim but cant dunk on it yet. I did it today in front of a whole bunch of people.
I'm 5'10 and I like dunking on my friends on 8'5. I can dunk 9, but not anything else. I also broke my knee, hyper-extended it, and tore the legaments a year ago, i have about 20'' vertice right now. Also having a 36 inch vertice may be exadurating, but maybe 20+ inches is realistic if you take Air Alert.