507's are always nice. I still want to see one in the flesh!
There is an old movie with a nice 503. Great sound too.
"The Last Run" with George C. Scott. Not a great movie, but I enjoyed the car. http://www.imdb.com/title/tt0067329/
Elvis had a 507 as well.
John Surtees(Ex F1 Champion) probably has the best 507 available. It has an uprated engine and all round disk brakes. Silver with a red interior. I think it is still original with no work done on it. http://www.bmwworld.com/models/vintage/507.htm
I actually saw a Z8 a few weeks ago... sort of makes you wish BMW kept designing them that way. At least the new 3, the Z4, the facelifted 5, and the 6 aren't a bad effort.