Check the classified of this site. Both our 1996 GTSs are listed - the blue and white GTS is at $47,500 with lots of goodies for the track (including spare wheels), the "right" modification, very well maintained, and a FULL WARRANTY until late 2003.
Buy your Viper from a knowledgable owner - there are WAY too many idiots out there that will tell you all sorts of crap.
And lastly, pull the service history and have the car inspected either by a Viper tech, or a fanatical Viper long time Viper owner - they'll see things that most humans will not!