
Mercedes-Benz SLR McLaren ($457,250): A GT supercar, the SLR McLaren is the fastest automatic transmission car in the world with a top speed of 207 mph+ and reaching 60 mph in 3.8 seconds from stand still point.
Source - http://www.thesupercars.org/top-cars/most-expensive-cars-in-the-world-top-10-list-2007-2008/
This is the 7th most expensive car in the world.