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Welcome to s2ki! I'd suggest going to tirerack.com and using their "wizard" that allows you to choose the S2000 and selecting various wheels that would fit our car.
Here's a pic of my Berlina with 18" Volk GT-U's in silver. The car is on stock suspension and has not been lowered yet. Two other nice choices for wheels are the SSR GT3's, and the Work Meister S2R's.