i typically dont consider top speed to be a good indicator of speed, as odd as that may sound, because of speed governors...
while the viper is an awesome car, i feel that it is far too often touted as being this untouchable monster, which simply isnt the case...hell, the mirada will beat non-srt10 vipers in the quarter mile...
if i had 90,000 to spend on a car, i would have a hard time buying the viper over the M6, simply because the M6 is such a complete vehicle...if i was buying a car purely for track fun, it would be down to a viper or a Z06..but at 3200lbs, the Z06 is hard to turn down at 20 grand less.