I sold my NSX 3 months ago and bought a Cayman S. I disagree that maintenance costs on new P-cars are high. The FIRST scheduled maintenance is at 20,000 miles. The first oil change also corresponds to 20,000 miles. It costs approximately $1K for the service. Comparing apples to apples, taking your new NSX to an Acura dealer at its scheduled maintenance intervals of 7500 miles, 15,000 miles, etc. won't be much less when added up. In addition, the three Porsche dealers in my area automatically give Porsches loaners as part of the service. At least two of the dealers, including mine, will pick your car up from work or home and drop off either a Cayman, Boxster, or Cayenne courtesy car. There are not many Acura dealers that will provide that level of service, if any.
As for performance, the Cayman S is very similar to the NSX. Considering the maturity of the basic NSX design, that says more about the NSX than the Cayman. The NSX is a fantasic car even today. However, stock to stock, the Cayman is slightly faster, brakes much better, is more comfortable, and (gulp!) handles slightly better. This is still hard for me to admit since I owned my NSX for 8 years and still love the car.
Best of all about the Cayman S is that many owners have found it very easy to make power in this platform. Removal of the restrictor plate at the entrance of the intake has netted a dyno'd 13whp and costing the owners nothing. One owner with headers and catbacks is making over 300 hp at the wheels with SAE corrected dyno runs. At a weight closer to the S2000 than the NSX, the Cayman S hauls!
