David
I would also consider to look at the Japanese market. You can get nice and well maintained cars (911) over there although most are LHD.
No Japanese offers a used car which is not ok, because that would definitely be a "loss of face"...in a country where you can leave your iPad outside a street cafe on the table and come back 10 minutes later your iPad still being there.
Here is just one example of a Japanese dealer. Prices for used cars are very interesting in comparison to almost sold out California. (No relation to them just found it in the net).
http://www.garagecurrent-global.com/all/The video below is not Porsche specific but it shows nicely that the Japanese are in general very good care takers (not only on vintage cars).
http://www.youtube.com/watch?v=AxvsRlHuEo8
