I'm sort of a halfway in between kind of guy on this topic. This is my first Viper, but I have wanted a Viper for about 14 years now. Loved my friend's red '97 GTS. Prior to driving his car, I thought I was a fan of refined performance and a well-rounded balance between grand touring and barnstorming. That 97 GTS showed me that I really wanted an intense driving experience and the car's grand touring capabilities was a very distant second.
I did consider some other possibilities before buying my Viper. My twin brother has a new C7 stingray and loves it. I also considered a C6 Z06 and 997 Porsche 911s. However, none of them had the intense driving experience I was looking for. Nor where those cars even remotely interesting to drive at normal speeds. The Viper holds your attention during all driving situations, not just performance driving. That was important to me. When I rented a SRT Viper last August, he was immediately clear that this is what I was looking for. When you drive a Viper on the street, it feels like you're packing heat in a way that other sports cars can't deliver. It feels overly extreme and crazy in an really good way. Kind like taking a well behaved grizzly bear to a dog park.
I agree with ViperSmith that the Viper is in sort of a funny place pricing wise. It always has, actually. Sort of around the price of a 911 (if not a bit less), but it performs with a 911 Turbo (I think this is still true from a roll and it spanks the Turbo on a road course - always has).
To me, the Viper delivers the most special driving experience and the most intense driving experience of any the cars that I can remotely purchase today. However, I'm proud to say that if I could buy any car that has been made, I still would've bought the car that I have. It's just the right choice for me, but I definitely understand why someone might want something else.
-Nick