I bought my RT/10 first. Spun it out on the track a few times and decided I would have to end my life if I ever wrecked it so I bought the GTS which was already a track car when I got it.
I still plan on buying more Vipers, just 'cause I like them. It would be nice to have another RT/10 so I could leave the hard top on it and have another without the hard top, and then also get another GTS for the street, and another GTS for the strip, and a Comp Coupe for the track, and a 98 GTSR, then get them in all the different colors, sets of each, one set with stripes one without, then...
...eventually it would be nice to own every Viper ever built.