@cannotstop, I don't think these are going to be second-hand bargains, though. A limited production run of a car with huge demand means that prices are going to stay high.
As for the commenters on Autocar, claiming a Cayman's "better" than the 4C as a track car, they're mad. They've similar price and shape, but they're not in the same class. Besides, you might be able to buy a (lower powered) Porsche Cayman for near the price of a 4C, but there's no way in hell you can run one for the cost of owning a 4C, and the Cayman will always be a heavier car no matter how many horses you have.
It's a shame there's no tight, twisty racetrack with the same status as the Nürburgring - there are so many long sweeping stretches of the 'ring that a good time is only about how much power you've got. A fast Nordschleife time really tells you very little about how much fun you could have on a mountain road.