This is an unabashedly big, powerful, luxurious GT car, complete with a 5.2-liter twin-turbo V-12 making 824 horsepower and a 214-mph top speed. Aston says the final-drive ratio was chosen to enable that high top speed, but acceleration is still strong-0-60 mph takes 3.2 seconds. Aston Martin plans to build no more than 1,000 a year, and the base price is $420,000. What do you think-is this the Ferrari killer Aston needs?