The difference in 17s and 18s is slight. 18s definately look a LITTLE bit better to me but to the average person, they won't be able to tell. The price of 18 inch tires to me is not worth the little bit of appearance gains. Depending on the picture, I sometimes can't even tell what size the wheel is. I'll take the $400 or $500 I saved on 17s and put that toward a blower.