Greg,
I love all kinds of cars, and have owned small engined turbo autos in the past, and enjoyed the zing of getting the turbo up on boil, and shifting gears to get back up on the power curve.
So I can understand your qualms, and of course choosing a car to suit your particular tastes and needs is wise.
I'd say that you should consider going with high flow cats, and a Corsa exhaust to run cooler and quieter. I had Corsas on my Corvette, and it's nice to cruise with a mellow burble, but have the roar when you go WOT.
For me, the Viper has been a dream of mine for years, and frankly I never guessed that I would be able to afford one. I really loved my last Corvette convertible, and I didn't think that I would have sold it after owning it for a little more than a year, but the Viper was too much to pass up.
I like the Supras, and they are easily modded to provide great performance along with comfort, and in fact the C5 Corvette can be similarly fast with good comfort as well.
But the part of the Viper that I've been enjoying, that would be sorely missed if I sold it is it's unique style. Some people are intimidated by it, but most people love the Viper as it represents wild dreams, excess, and fun.
You can find that in Ferraris and other exotics, but it's not there in the Supra, which may be just as fast (or faster), but is more of a sleeper when not riced out to look outrageous.
Because I love all cars more than being devoted to a particular brand/marque I can actually see myself getting another car someday to replace my Viper. Right now I just can't imagine what would be better than the Viper for my preferences for a roadster/convertible, having supercar performance/handling, stunning style, and being reliable/affordable.
-Dean.