THE world's ten most expensive cars include such dreams-come-true as a street-legal, ten-cylinder Porsche race car, the Carrera GT, and cars with over 1000 horse power (HP) each. These kinds of cars make Ferraris and Aston Martins look like relative bargains; despite their fame, they are much cheaper than the cars on the Forbes list. Of the ten most expensive cars, only two are made by brands with household names, Porsche and Mercedes-Benz, although that depends on what your household is like.