yeah Vipers are often overlooked but they arent as user friendly as a GTR from what i have HEARD.
I still think the Z06 has got to be in that lineup, not even the ZR1. Just the plain jane Zo6. Sure it may not be as fast as the GTR, but what is the MSRP price difference? Isnt the z06 still 65K? GTR still around 80-90K