Here is something that might look nice on a Crossfire. A staggered set of 18" wheels which Is what I did to my car. You can use the stock front tire with these wheels and either 255 or 265 40 18's look great. I am using knock offs of the AMG 63 optional wheel.

http://cgi.ebay.com/ebaymotors/Parts...1%7C240%3A1318