You really need to look close at the tires that you want to run as part of your decision process on wheel size. The selection of 15" tires is decreasing day by day, leaving us to get tires from specialty guys like Coker. Saving $20 on a wheel only to spend $50 more on the tire is one of those things that makes a guy unhappy, and it's only going to get worse. Sunsetdart is right on with the visual impact - wheels & tires should compliment, not be the focal point.