Alobar, man,
I don't climb much at all but awhile back I read
this article (it's also the first Google hit for Osman). Outstanding article I recommend to all, whether they care about the sport or not.
On topic, I'm 6'3" and I consider that the perfect height. Tall enough to see over most people, chicks dig me like a ditch, but not so tall that I have to buy clothes at Big & Tall shops or fold myself into coach seats on airplanes.