I recently went shopping for 18's, I looked into wider in the back like 9-10. The only downfall is options become seriously limited. Especially in the off setting with wider in the back. 18's look alot better, but there were only a couple options from each company. you increase your options going with the same width all around, but the tire place mentioned some rubbing with 18's, especially if you're going with the H&R lowering springs. My advice is going to a knowledgable, credited tire shop and dealing with someone who knows what they are talking about. Especially with the rarity of our cars, some 18's won't just slap on and drive away. Choose wisely. Good luck.