Either Bentley Mulsanne, Brooklands, or Azure, Ferrari 599 GTO, Lamborghini Aventador, or Mercedes CL65. Would not be able to decide on one, though..
If an everyday sedan, I'd at least get the S63 AMG, or S600..
For something somewhat practical.. Mercedes ML63 AMG, BMW X5M, or Porsche Cayenne Turbo.