I had a Cayman S and changed for a 997 C2S. From what I learned from buying the Cayman S here's what I went with:

- Sport Chrono - essential for the improved throttle
- Sport Exhaust - the best addition - it beats the Cayman by a mile
- Thicker s/wheel - like it
- 19" carerra sport
- Red belts - nice with the red calipers
- Sat Nav - you have to

And some other stuff. But here is the big lesson - if you like changing your car you will get next to NOTHING back from all your options. All they look at is mileage! If I traded my 6 month old C2S in perfect condition with 10k on the clock I will have lost 16k in that time !!! So - either keep it trim with the options or keep hold of it. Unless you like losing cash!