Since the allure of the Viper can be found at the other end of the throttle pedal, consider what other high torque engined cars might also provide you with the level of visceral excitement that the Viper did on your test drive. As a suggestion, a Superformance Cobra with the appropriate engine will likely press the same buttons the Viper did. One neighbor had a Superformance with a 408 Windsor that was a torque monster. On a test drive with him driving, he hammered the throttle producing instant massive acceleration.......my head felt like it was peeling off of my neck. By the time I successfully struggled to regain horizon, he pulled for 2nd gear and the rocket sled ride was repeated. Insane forward motion. Definitely a moon-shot.
Another friend of mine has a 2016 Mustang GT with the Hennessy supercharger package that Hennessy claims puts out 700+ horsepower. Even with drag radials, traction is a challenge with the rear end wiggle wagging all the way down the road any time he exercises the throttle pedal.
From a somewhat different perspective, consider that most new car showrooms have had at least one brand new factory built car with 500+ horsepower available for each of the past several years. For example another neighbor had a Mercedes E63 AMG sedan with 507 horsepower that he sold recently to his son and daughter in law as they needed more room for their growing family than her SRT8 Challenger could provide. That Mercedes was instantly quick, almost brutally so, and but for the son and daughter in law pulling the trigger, I'd like to think that car would be parked on my side of the street!!
My point is, you have lots of choices, all good, some possibly better. Enjoy the selection process.
*Principal wrench on this 69 Mach I*