I don't know how you guys can pick just one car, I find it really difficult.
There are cars I've owned and would have back again, cars I've always fancied but never owned, and a few that I could probably never own. The Citroen DS is a real tempter, and Jocko's Austin 16 is a pearl, but I would have to give this some real thought.
I fancied a Citroen C6 after having the XM, but you could easily go out and buy one now and run it, so hardly fantasy stuff.