If it were me it would have to be the Rabeneick. I don't actually know much about, however, it was built in 1958 and for that era looks to be thoroughly "modern" and therefore cutting edge for the time. It also looks like a nice bike that you could actually ride regularly, perhaps with an alternate wheel set.

Being so special is a problem too. I would not want anything to happen to it. Could you get an old Trek 800 or something similar and use that to run errands and stuff? Hide it somewhere so it doesn't count? You can't have a bike like that or any of the bikes posted and use it to go to the store. Well maybe the Peugeot.