I've had the pleasure of driving all three of these cars. There is only one that I've come completely impressed with: The Z06. While some may argue that the Porsche is better built or that the Viper exudes attitude, I think the Z06 gives you the best of all worlds. Both the Viper and 911 are marginally slower than the Z06 and ridiculously more expensive. The Viper had styling that said look-at-me. The 911 felt more button down, but not buttoned down enough at $132,000-- before options!!!! The selling point for me was the compliant ride. Here is a car that is capable of 0-60 in 3.5 sec, 1/4 mile et of 11.2 sec, and capable of reaching speeds in excess of 200 mph. Yet it is civilized enough for daily operation. And as you can tell by the screen name, I'm a Mopar nut. But at $86,000 for a car with door sills that get hot enough to fry an egg, I passed on it. The Z06 I chose was a special factory order. It's Asiatic blue with tan leather/suede inserts(you won't get this selection at your local Chevy dealer). I personally went to Bowling Green twice. Once to make the order. Once to pick it up. Total cost: $72,979.23. Me personally, I'd call that a heck of a deal. I've got the Borla exhaust(I know,I know. It already has a great exhaust system, but it's never enuff, right fellas?) and the K+N Cold-Air induction upgrade coming. Hypertech says that the Programmer 4 should be ready at the first of November. This car is capable of stopping from 60 mph in 94ft. That's not enough so I've got the Baer ceramic pads with the cross-drilled rotors on it already. It stops now in a whiplash-inducing 86ft. Anybody ready to run, I'll be ready!!!