Erm, the Cayman is a great car. I think it's beautiful, and it's perfectly balanced (all that mid-engine nonsense mentioned above). I love 911's, but honestly they can never be as fast or good-handling as a Cayman can. That's why they don't offer the same HP numbers for the Caymana as the 911; they can't eclipse their flagship model.
Anyway, if you don't need a sedan, I would go for the Cayman S. But it's up to you; go drive one!