[RandallNeighbour]

Just for fun, I build Boxsters and Caymans on the US Porsche site all the time. Some of my must-have features are:

Ventilated seats (because I live in a very hot and humid part of the world)
Xenon headlamps (called Litronics on the Porsche)
Bose Sound system (can't afford the Burmeyster, even when I'm dreaming)
S model - I would HIGHLY recommend you do without some other features and get the larger engine. You'll not be unhappy about that decision, and the resale value is much stronger in my opinion.