19. Bentley Continental GT Speed Convertible
Feast your eyes on what Bentley is claiming as the "fastest four-seat convertible in the world." Hot off the press, the GT Speed convertible will boast a twin-turbo, 6.0-liter W12 that puts out 616 bhp, all while improving its fuel efficiency by 15 percent. What other drop top has those kind of numbers to go with an eight-speed trans?