Honestly, and I hate to come off as a nay-sayer on the 08s, but you know who the 08's REALLY appeal to???? Current Viper owners. People who can appeciate the bettering of the bread, and how the 08 is certainly the high water mark for performance and all out race-car made for the street of all the Vipers.
The problem is to attract NEW customers, they needed to change the car completely on the outside, because effectively the outside looks the same as the 03-06's. So if that 'design' was failing to meet market excitement, how did they think the same look and design would do it again, short of adding more HP??
The Viper is an emotional decision based on looks, feel, and rawness... I have no problem admitting the 08 is a better viper then my 06 (stock). But it looks the same. Where as the GTR is ALL new.. so you get to be the NEW kid on the block with that look, not a 08, who's LOOK is 5 years OLD. And the ZR1, while some feel looks RICEY, it ISSSS a far more flamboyant look then its base box, or z06 counterpart. Even still I think the zr1, short of attracting Bow-Tie Die Hards, would also have struggles when it came out, if its only change was a hood and more power.
New 'looking' sells. Most people spending this kind of bank want NEW LOOK AND FAST.
Thats my 2 cents. And its not to slight the 08s. Its human nature... we want all the fastness but also want the newness/stand-out when we are interested in buying NEW models of things.
Jon