Isn't this about the point in the thread where someone posts the message that says "ride them all and go with the one that is most comfortable to you?" My perspective is that the dimensions really aren't tremendously different, and certainly can be tweaked (e.g., a different steerer and stem on a 'racing' bike can make the dimensions pretty much like a 'comfort' bike). But all of the measurements can't equate to a good feel. Find a bike shop that is willing to work with you to get the optimal fit. That will be more important than whether you choose a comfort or racing model.