Don't know if this will help you or not, but my friend has a Civic EX Sedan (2000) that had 15" wheels and he got 18" chrome one for it. The ride is VERY harsh when the asphalt is cracked up and he dodges pot holes like a champ. He hit one pot hole once and dented the shit out of one of his rims. Pot hole was fairly small and he was doin' about 40 Mph when he did it. Dent was so bad it broke the seal on the tire and went flat immediately.
Unless the roads are pristine in your area I would say stay 17" or less -- especially if you drive agressive like most Si drivers do ! ;)
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