From Reventon to Reventon Roadster, you’ll definitely don’t want to miss this 5th car in our list. This is the roadster version of Lamborghini Reventon; unveiled at the Frankfurt Motor Show in 2009. Sadly, this fifth placer on the top ten most expensive cars in the world of 2011 is slightly at par with its ancestor’s top speed; heat it up for 3.3 seconds to reach 62 mph.