I use the A038R on a Porsche.
When properly warmed up, this tire offers a performance that's as close to a slick as a road legal tire can possibly be, IMO.
In the wet...well, slow down .
The A032R isn't really comparable.
The tires on this pic already have quite a few track miles on them and still perform fine -

 

Cool tire, but R-Compounds are definitely an crazy choice for everyday driving because of their short life.

These Falken Azenis are the hot tire on the street tire class autocross circuit. They're referred to as "cheater tires" because they perform so much better than any other road tire, albeit not as good as racing compound tires.

Although they don't come in a good size for the S2k yet, I've heard that they will sometime this year.



Personally I think they're pretty sweet looking and can't wait to get them on my S2k!