RE: 08 challenger srt8 or 09 nissan gt-r
You might want to consider a BMW M3 coupe. It always comes down to what you want the most in a car. I have no interest in the datsun and for the money would purchase a BMW or even a used MB SL 500 which is a hard top convertible. I for one have always enjoyed old cars and always thought if we could reproduce the shell of an older car with the modern technology, that would be the way to go.