[Pilot2519j]

I would pick the S which is what bought for the following reasons:
1- More power.
2- Outstanding brakes from the 911
3- More options as standard equipment. 18" tires, stiffer suspension, etc.
My previous car was 2001 Audi S-4 which was fast. I considered buying the new S-4 with V-8 334hp and that was faster but at 4000 lbs felt like a pig. I can say that the way the Boxster S feels quicker that even the big V-8 334hp S-4 and the steering of the Boxster S is beyond adjectives. There is nothing I have driven before can compare.
I strongly suggest the S selection over the plain Boxster, also a formidable driver and roadster, if money is no object. Both models are outstanding roadster but the S is just a tad better.