As much as I know you can spec an s with 20" wheels, spasm, sport chrono, TV. The only thing you can't get in an S is the extra 15HP. So unless you're going for the gts 4.0, you can buy an S and spec it with all the goodies the gts has. My s is white and the most beautiful rim for a white Cayman/Boxter IMHO is the 20" black which is not available for the regular and s models. Only for the T and gts.