A bit of an update for me (relevant to this topic).
This past weekend I sold my '05 S2000. I bought it new and put about 50k miles on it. It was babied (looks and drives like new) so I got top dollar for it (above retail value), hence why I sold it. It was a good deal for the buyer too because it still had warranty and was never modified. Not a single accident either.
Now a few days later I find myself filled with regret. I love my Z so don't get me wrong, but I miss the S a lot. I ride sport bikes but only on weekends. The S was like riding a sportbike during the week. Truly an amazing experience!
So now I'm hunting for a used S2000. My budget is fairly low because I want to build more of a track car with it this time but there will be one sitting in my garage again soon.
I'll have my Z for a long time, but I'll probably always have an S.