It would be worth a trip to an LBS to try bikes for fit. You may find a deal on a leftover that makes used not as great a bargain, and if nothing else narrow your search for used. I'm 6'4" but long legged and short torsoed, so fit better on 60-61cm. You can only tell so much from "information," you have to try. There is some value to expert individual guidance, which your LBS may or may not provide.