Personally, if I had this kind of money to waste on a car, I would go with the Lingenfelter twin turbo Z06 Vette. Can you say "Snake Skinner"
By the way, BMW and Audi may make some cars that are more expensive than the ZR1 Corvette, Viper, or GT500. But if you drive a BMW or Audi you will have to learn to appreciate how nice the tail lights look on these cars as this is going to be the only view that you will get.