That's not bad. You're right on that...for 15" slicks we'd have to downsize the rotors and get new caliper brackets, which i really don't feel like doing..
here is our other option, and this is probably what i'm going to do. i'm just waiting on getting my car back and i'll be placing an order for these.. M&H now makes a 17" slick for sport compact cars..they don't have as much sidewall as a 15" would obviously, but I still think it beats a 17" radial..
http://www.mandhdragtires.com/8-5-26...ace-slick.html