whatever, i'm 5'9" with a 31" inseam, and i would've been bummed if my 53 Mark V was any bigger. dude's got 2 inches on my inseam (first time i've ever said that).. and based on my experience, i think he will be perfectly happy with a 56cm but stoked on a 53cm... (59cm too large).
Ziemas, i see you don't even ride an IRO... so dude should probably ignore you and listen to those of us with the frame in question.
i prefer a bike that i'm in control of, not the other way around.