If talking about us built cars its easy for me....the 53 Studebaker coupe by Raymond Loewy. If its open to cars built elsewhere the choice becomes pretty tough. The Ferrari mondial is a lovely car though.

Pictures of the 53 here.

.http://www.peachparts.com/shopforum/open-discussion/348421-studebaker-slab.html

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.