I agree with you that Cayman is a good option for entry level Porsche sportscar for many prospective buyers.
I, for example I owned a Boxster before Cayman was introduced. If a fixed roof coupe of similar price was available at the time, I would have never bought convertible.
I was given a new Cayman S PDK (the one at the back of the picture) from the Porsche Centre to drive to the mountains last Saturday and I found it a top car.
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It's not where you're going, it's how you get there that counts