You have always wanted a Viper right? The market is soft right now so their value has gone to shit. If you've got the means to buy a Viper, go for it. I'm not a Viper fan, but unless you own one, you'll always lust after one. You'll enjoy your C6, but you'll feel sheepish every time you see a SRT10 and kick yourself for buying the vette. If you've got the means to pull the trigger, just do it.

With that said, I think once the novelty wears off, you'll trade it for another Vette. (or maybe even something that's actually nice... referance Dave's post)