SSC Ultimate Aero $654,400. Don't let the price tag fool you, the 6th most expensive car is actually the 2nd fastest street legal car in the world with a top speed of 257 mph+ and reaching 0-60 in 2.7 seconds. This baby cost nearly half as much as the Bugatti Veyron, yet has enough power to compete against the most expensive car. It is estimated that only 25 of this exact model will ever be produced.