I'm gonna have to go with the Rhinebeck too. It was so over the top and so way far ahead of it's time. Although, it's not a practical rider..
Now as far as I'm concerned, I'm going to have to say to me, this has got to be the most beautiful bike... Bikes are about seeing the engine.. seeing the parts that make it go... and to have an old rotary plane engine as the centerpiece, unbelievable.. I would give $1000 just to have the owner fire it up so I can hear it... (I do know Jesse James built this, but not sure if he owns it or not) I would imagine the sound of it riding down the street would clear the road around you..