If you want a toy car, definitely get the S2000. Everyone doesn't have one of them, as opposed to the Miata.
I was lucky enough to drive my father-in-law's new S2000 last weekend in LA. A great car, but if you want great bursts of speed, you have to learn to keep the revs above 4000. (The thing redlines at 9,000+ rpm!)
I just barely fit behind the wheel of the Honda, but it was still quite comfortable.