I think it all depends on your preference. For me, I prefer a concave wheel (not flat) to give some depth to the wheel. So for our 1st-gen (2006), we went with 19"x 8.5" wheel with a 35mm offset (on a 255/50/19 tire). As you may know, the lower the offset, the more concavity.Do any of you guys know the best combo for 18",19" and 20"? Wheels and tires? I'm trying to find a wheels and tire combo on craigslist.