Well, my proposal (and keep in mind I'm just making suggestions) was that Coupe de Ville be kept as it is the grammatically correct term. The problem there is that most people spell it as Coupe DeVille. Since Antp confirmed that Sedan de Ville is gibberish in French, I'm inclined to keep it as Sedan DeVille in order to avoid multiple spellings of the same model.

Now I realize some will take an issue spelling it one way for the coupes and another way for the sedans and I'm certainly flexible on the issue. But whatever is decided, I do insist that it be consistent and definitive. No more of this half a dozen different interpretations of the same name.