[mjw930]

I most certainly would not go with the Nero's, they are an all season tire and will greatly detract from the precision as well as ultimate grip the Boxster has.

In the 18" size I'm a fan of the Michelin Pilot Sport N1 (Rib) tire. It's very quiet, has great traction, retains the proper sidewall stiffness to keep the steering from going numb and offers pretty good wear relative to the other N-Spec tires out there. In an N-Spec tire this is the most responsive I've tried.

If I was going away from N-Spec I would seriously check out the new Yokohama ADVAN Neova AD07. This tire has been getting rave reviews. The Bridgestone S-03 is also a top notch tire but it's noisier and even shorter lived than the N1 Pilot Sports.

I personally do not like the Michelin PS2's in the 18" size and have them taken off the car after 1000 miles because they simply didn't feel right. They caused the car to feel sluggish and made it tail happy at the limit, especially when off weighted in turns. Please note, this is the non N-Spec PS2 in the 225/40x18 and 265/35x18 size. The N-Spec PS2's don't seem to exhibit this trait but they don't make them in our sizes.