Is a porsche cayman s worth buying?

I would defiantly say you're getting the best value for your money. You're paying for a fine sports car. The extras are expensive but that goes for Porsche, Mercedes, BMW and any other German Luxury make. Have you considered the Mercedes E550 coupe? It's bigger but is a great performance car. Extras are expensive on it as well, but I don't think you'll be disappointed if you look into it. As for the Porsche go for it, it will be a big investment but one you won't regret.