Hey WillysWagon,
I'm 6'4" and have a standard length medium Columbus. The length is fine for me because I sleep on my side. If you sleep on your back and sleep with your head in the high side, your toes will touch the roof.
I was with some friends that also have Columbus tents and we were talking about cold weather. All of us would reverse and have our heads in the low side, seems warmer that way.
Mike at AutoHomeUS may not be able to help you find someone up in Prifnce Edwards Isle to show you a tent, the Canadians who work with Mike usually will come down to the states to pick up a tent. Shipping these tents is a real pain. They are packed in foam, put into a double walled cardboard box, then crated. I wouldn't be surprised if the packing weighs more than the tent. I know it takes me at least 20 minutes to unpack all this stuff. I would not want to have to repack it all, probably why the dealer hesitates to do this for you.
It is a little bit of a blind purchase, AutoHome is always improving the tents so the new ones are always a little different. The technology is pretty much the same throughout the line. For example, the fiberglass process is the same with the Maggiolina and Columbus. The foam mattress is the same only the Columbus is a little lighter and thinner. If you don't like the Maggiolina's, you will not be happy with the one in the Columbus. It is a good quality polyurathane foam, you may want to put in a latex or something better down the line. The main difference is on course the way they open and the space inside. Because of this the Columbus uses a more water repellant fabric, Airtex, a PTFE lined fabric, so it still breathes.