Thanks for the feedback. I was looking at some 18x8.5 wheels and a set of Michelin super sport tires in 225/40 in front and 255/35 rear. Do you think putting different sized tires on the same wheels is a bad idea? I figured you wanted slightly smaller tires in the front for better steering response and fat ones in rear for grip.
I currently have stock 189 style wheels 18x8 front and 18x8.5 in rear with 225/45 front and 255/35 in rear and it seems okay to me.