It depends on your goals. Are you primarily concerned with appearance ( which is fine) or cornering grip and balance? Do you have any other means of adjusting the balance, such as bars/alignment. If cost was not a major issue, I would go with the largest fitment, and balance that with antiroll bar adjustments. Say 245/275 or 255/285. I just went to 245/265 to reduce under steer without having to buy antiroll bars, or use an aggressive alignment. I'd say the minimum would be 235/265 like the factory 987 fitment.
Oh yeah, my car "tracked" with the factory 235's, the 245's don't seem to have made much difference.
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