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It depends on the look you are going for, but IMO, the best size for the SC are either 18's or (if the car is lowered appropriately) 19's. And lip size depends on the type of wheel. Check out the wheel fitment thread on the top of this page.
It all really depends on the style of wheel you want. I recommend looking through the wheel/tire thread and just look at all the different wheels in there. Work Equips and SSR SP1 Professors are two of my favorites, but they're both a little pricey.