Which option (or modification) makes the most difference in the enjoyment of your Boxster? The one that you can't live without?
Aside from all things that make the Boxster wonderful (automatic convertible top--unlike the new Spyder

), the handling, the styling, I have to lamely say I enjoy the sound system. I'm an audiophile, and I am so happy the previous owner paid for the upgraded sound system. It's fantastic with a CD (acceptable to most when plugged into an iPhone, but iMusic offends me) and the sound range is very similar to a Bang and Olufsen.
What's your favorite upgrade?