Unfortunately I can't help you with the tire sizing, but can recommend you call tirerack.com or contact your nearest Costco I'm sure that either can help you with that.

As for the Pilot Sport A/S's, I've been running them now for the last 17 months, and they are just about gone. I've got about 35,000 miles out of them so far. Almost all freeway, no track or racing. I figure about 2500 miles more before they are completely bald. As for feedback, they are probably the best wet weather tire that I have ever driven on, but they are quite loud in the rain. As for dry, they are abit slow, and the sidewalls aren't as ridged as the original pilot sports. You can really tell the difference if you start to push the A/S in the corners. They have a tendency to slide out more then the original pilot sports. In snow they are ok. I wouldn't recommend them for more then commuting in LIGHT snow. Anything over about 2 inches and you're going to be spinning your wheels literally. They offer a bit more traction then the original pilot sports, but even with the a/s I didn't feel comfortable driving in snow that much. I would rather have a dedicated snow tire.

Good luck with your tire shopping...