Back when I owned the SC430, I replaced the Dunlop run flats with 19" Michelin Pilots and, wow, what a difference! Even my Lexus salesman remarked at how he was impressed with the performance aspects of those tires. My M6 came equipped with 20" Michelin Pilot SuperSport tires and the only negative regarding those is that I had to replace them twice during the time I owned that car...which was probably due more to the wear caused by the 500HP V10, than anything bad or defective about those tires. Pirelli PZeros are another good option for your car.

 

You replace PSS twice already? They were out only last year:yikes:

 

I don't have any experience with them, but from reading different reviews online I am going to go ahead and try the super sports when I get my car.