As suggested, there are benefits to an "S". However, it comes down to how you will use the car, too. If you plan on tracking, a "S" would make sense because of the increased power, brakes and cooling capacity. To just drive around town? you might not notice.
I sold my '78SC and ended up with a 2000, non s Boxster. 217 rated hp. Love it. I autcrossed a few "S"s last year and honestly didn't think they were as "strong" as 250hp should be. I felt the base car, in this environment, to be very competitive. At the track I may wish for more hp,(or bigger brakes) but more than likely, I will just learn to be a better driver to make up for the hp difference
