Personal opinion:
I recently followed a red a first gen/3-spoke RT/10 rolling through traffic and it was turning heads everywhere. Yes, my 5.0L would easily match that car in any performance measure but it might as well have been a Honda Civic in the presence of that roadmonster.
Even the earliest Vipers are respectably quick even 23years later, can be hot-rodded to insane levels, but it almost seems irrelevant. They're just special.
If we're talking about the last gen Viper...they're just incredibly good looking and brutally fast. Sorry, GT350R but the Viper owns my heart.
I'd have a hard time picking between the most special version of a common car (GT350R) or a copy of a car that is special, outrageous and exhilarating regardless of the generation or version...and that's a dilemma that I would LOVE to spend some serious time struggling with.