Think big.
Like [MENTION=10687]seely[/MENTION] above, I'm a 6 footer with long legs and best fit bikes normally found under guys who are 6'2" to 6'5" (61-64cm on a traditional roadbike) The two pictured below are set up to fit me as best they can; though the bars on the green one (1985 Raleigh Elkhorn Mountain Track) don't go down far enough for my liking and blue one (1985 Shogun Prairie Breaker) feels a bit short on the top tube, which I don't mind for single track, but would probably hate for touring.
BTW, both of these bikes are ones I'm thinking of selling this spring, so PM if you like to talk details or get exact measurements.