It is true that it is easier to damage your rims the lower the profile of the tire.
I considered getting 18s also but decided on 17s for my car. Every inch in diameter will cost you about another $100 per wheel and $50-$100 per tire (I go through a lot of tires). Also, if you have a stiff handling suspension, the lower your tire profile the harsher the ride.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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