Continuation car or not, its basically a glorified kit car. There is no history there, no X-factor associated with the real thing. I'm sure it would be a fun experience, but at the end of the day you didn't drive a Shelby Cobra 427...you drove a replica of a Shelby Cobra 427.
They are fun to drive for all of 30 minutes...after that it gets annoying, especially in an urban setting. Its one thing to put up with the heat, vibration, and noise associated with a real 427...but a kit car? I'm not sure I'd be down for that...
The Bentley seems like the best choice of the three. Comfortable, fast, and has class the other two don't. It'll turn heads just like the Viper or the Cobra, and people won't look at you like you're a middle aged man going through a crisis like they would if you're driving the Viper or the Cobra.
Basically, it goes down like this.
If I had the car for 30 minutes, I'd take the Cobra. A couple hours, and I'd take the Viper.
But all day...well, the only one of the three that would be comfortable for hours upon hours of driving would be the Bentley. Its also the one that people are going to look at and wonder who's driving it...because the Viper is Joe the Plumber's dream car, and the Cobra is just a toy that makes too much noise (unless its the real thing, in which case you are a God among men for driving it on public roads
).
But the Bentley...well, you could be a famous rapper, athlete, or actor