These are good times indeed. The muscle cars (mustang) and exotic sports cars (Viper) are at an apex, never before seen from American auto manufacturers.
While they are not cheap, the prices are attainable by many Americans with specialized work talents.
The market place will speak as to their relative prices, with I suspect Mustang getting a premium over sticker, and Viper being discounted a bit.
These muscle and sports cars deliver entirely different driving experiences. The Mustang is a nose heavy beast, while the Viper is well balanced. They are tuned for different racetracks. Mustang at the drags, and VIper on the road courses.
Both will draw a following, but there will be little overlap.
Think either on will be capable of putting a huge smile on their respective owners faces.
All the manufacturers have invested heavily in producing botique cars from their high performance divisions.
This is being done, even with intense pressure from the Eco minions that seek deliverance with micro mini cars you plug in at night.
These indeed are "the good old days". Pick your favorite, lay down your cash, and have the time of your life before this too is called to a halt.