Don't do it sox, I went through the same thought process. Do I really need to spend $1,800 on a selector knob? It's way more than the ride. It's the throttle, sound, dash etc. as to the ride, I don't notice much difference in every day driving. The ride is reasonably stiff in tour mode. I am very glad I bot the msrc.
When I got my C5 the only major option I didnt get was mag ride and always regreted it. With C7, I got the option. I cant say whether it was worth the extra $$ but I figure if Im spending $70K on a dream car, might as well get it with everything offered. I can certainly feel the ride difference in different modes, more dampening.
I've had two cars over the last decade with active damping, neither were Vette's but I've become a true believer in the technology. The GM version of the system is the benchmark others have tried but really failed to achieve and on a car like this I think it's money well spent.
Fun fact- At the Corvette Driving school in NV; the students were in Z51 Vettes while the instructor was in a Camaro. He was driving one handed and running a radio to give instructions on braking and lines to the students that were following. He was still whipping them in the corners. Skill and experience goes a long way.
Point being, that no matter what tools we have, it still takes skill to be the fastest.