Well from your sig pic there, I can see your not lowered any. So either rim will do fine. If you plan on lowering, don't go past an inch or so with those 18's. 18x8's have been known to rub when lowered excessively. As far as tires go, 235/40/18 or 235/35/18 for the 18's and 215/40/17 for the 17's. Hope that helps some.