Thanks for everyone's feedback.
I am hoping since my car has 27K on it and no probs other than the RMS @19K miles, maybe I am worrying over nothing. If I remember right, all the intemediate shaft probs happened at rather low mileage.
I've decided against the S2000 for now. I may buy one at some time in the future just to get it out of my system, but for now I'll put a few miles on the Porsche and hope for the best.