A venerable car fair with brand-new cars: the New York Auto Show. A touch of spring at a reasonable price -- the Opel Cascada convertible holds up in a comparison with the Mercedes E class. And the sportscar to end all sportscars: the AC Cobra Shelby 427 Mark VI.Examine it! New York Auto ShowThe New York Auto Show has roots that go back to the turn of the last century, making it one of the oldest car exhibitions in the world. From economical models to impossibly expensive supercars, this show brings every aspect of the automobile world together under one roof. One example: Audi debuted its A3 sedan here.Present it! Opel CascadaLike spring flowers, more and more new convertibles are opening up to the sun. Opel's new four-seater soft-top Cascada convertible is making a bid to enter the premium class. At 4.7 meters long, Opel is targeting the premium category, including the BMW 3 series and the Audi A5.