I agree that there's very little to go on when it comes to sizing yourself for an upright commuter. I can't decide if my LBS was of much help or not. I'm 6-1, so I thought that I would need the Breezer's bigger frames, but they proved to be gigantic, particularly with the bikes' relatively straight handlebars. If you're reaching too far forward, the whole upright concept is defeated. I've seen it mentioned elsewhere on the Forums that before you leave the shop with a new bike, you should swap out the seat and pedals. When it comes to the Breezers, for me anyway, it was the handlebars.

These aren't road bikes. For the most comfortable commute, your weight really needs to be lined up vertically along your torso. Which tells me that a smaller frame may be better for many people looking for that whole Lowlands commuter experience. Smaller than the "charts" indicate anyway.