FWIW, a friend of mine just got a new Cayman S with 19's. with PASM. As a passenger on a drive of a few miles with him, I didn't notice it was any harsher than my Boxster with 18's and no PASM. Perhaps more driving would have revealed a difference, but it wasn't immediately clear it was harsher.
I'd go with the 18's. Tires are cheaper, wheels are lighter.
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Paul B. Anders / Phoenix, AZ
1970 Porsche 914 / 2003 Porsche Boxster / 2009 Honda Fit Sport Auto
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