Pick the one that suits you best in your budget, preferably not Michelin or Bridgestone
(personal reasons).
Personally, I get better performance, ride and wear from the Kumho tires than I did from the Bridgestones that came with it.
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I bought tires and the Tire Center STS the old WTC installed Marshall tires which allegedly are Kuhmo racing tires. The installation and the tires turned out to be a complete fiasco since STS did not have high speed tire balancing and the clown doing the work installed clip on weights on the Carrera rim. The number of things wrong in the install was scary and I still had a car that the tires were not balanced right. I went to Silver Star and the manager balanced the tires for free. I decided that the engineers of Porsche know which tire is better and insures you the best braking and handling performance better than any clown from a tire center. What you buy is your choice but I would stick to what is recommended. I had S0-3 on my 2001 S-4 I had a lot of problems with them, tranning & blowouts and they are not cheap either. I now have Michelin Pilots and even though they screwed up the Indy F-1 they seem to work real nice with the car.