I'm in Indiana and run 2 sets of wheels. The Z isn't my daily, but I still drive it year round. I have not been caught in snow and avoid driving while the slush and salts are still on the streets. Stock 18" wheels with Blizzaks are a great option and will clear sport brakes. I run spacers with my winter wheels, no problems. Not sure about Tire Rack's suggestion. Check with
Jason at
getyourwheels. He's a forum sponsor, has a good selection of wheels and can put together a package for a good price.
Stock 18" with Blizzaks and spacers