Full leather
Porsche newbie here. Had a long interest in the Corvette C6, then made the mistake of test-driving a Cayman S. In 20 minutes I was a grinning convert. So now I'm taking a cram course in everything Porsche prior to ordering a Cayman. The base car looks very appealing -- bi-xenons, sport shifter, sport wheel, sport chrono, maybe a rear wiper, silver/black. I like the simplicity of the manual seat, but I find the power seat more comfortable, although it may only be because it gets a position I'm more accustomed to in my current car, not one that's actually better. Anyway, I'm now looking at leather. Appearance-wise, the base interior is great, really just fine. The big advantage of leather, it seems to me, is its durability. It doesn't scratch, scuff, mar, and it's uniform everywhere; you don't have three or four different synthetic surfaces wearing and aging differently. Leather ages beautifully. I imagine putting it on the dash, doors and center console, which gets a lot of wear. Problem is, it's expensive. But this car will be my daily driver (tough assignment, I know, but someone has to do it). So you drivers who have the leather -- especially if you've had it a long time -- talk to me. How is it doing? How is it to clean? And so on.
Deep breaths! Take your time over the options list - it's one of the most enjoyable bits of ordering. Try lots of different options, with long test drives for the seats and suspension choices especially. And have fun!
from 12k miles. I have to say that the leather is good quality leather (contrast with the 'leather' in some mainstream sedans). However it will scratch if you're not careful. I have a small scratch on the top of the steering wheel, and I can feel it whenever I drive. 
