Thanks all for responses.
The above link was really helpful, as it includes reach measurement and then gives three riding style sizes.
I'm wanting this bike as a tourist visiting different places around Montreal (which has many bike lanes), but also for exercise (read: need to lose 10lbs and supplement my current workout). I figure while I'm looking for work I might as well do something interesting like start a blog about Montreal's parks, ride to all of them (there are too many), and have some fun.
Anyhow, came up with 56 seat tube, 54 top tube.
Going to look for used bike with those dimensions.