I've owned over 30 Corvettes, and I'll limit my discussion to what you really asked. Viper vs. Vette for second car, perhaps a little tamer would be better, something the above posters may not have considered, your Viper is a DLM car, about as untame as they come! Does your wife drive the DLM car? If so the Z06 is a daily driver slowmobile to her, no problem, and a good choice for both of you. If she does not participate in the DLM experience, then we have to start from a different standpoint....First as Janni mentions, what does she want? An, ahem, important thing to consider. After that it's down to how comfortable do you want to be in this second car.....AND, how much do you want to worry about it parked somewhere. I'm afraid I could no more leave a second Viper parked out of my sight than I could the one I have now. So my opinion would lean to the Vette, but it woud not be a Z06, it would be a convertible C5 for the sake of something different, heck even a coupe c5 would give you as open air an effect as an RT10.