Yeah that's a bad deal man - you'll be underwater 3 grand, and on top of that it's likely that the vehicle would have been driven hard those 15k miles.
However, if you really think it's that much more amazing than your current Camaro, go for it. This is 'Murica baby
And the car is in warranty.
Wait for like a week or so and see if you still want it as badly then. Let the initial feeling of excitement wear off. If you haven't changed your mind by then - you have a new Camaro.