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I would suggest going square and ditch the staggered wheels if buying new wheels and tires. You can then rotate your wheels and your full treadlife warranty will be in effect for the tires. If you go staggered, the companies cut the warranty in half. So your 30k treadwear warranty becomes 15k. On a current S, even more so with a Plaid, it could pay for itself long term.
I would suggest going square and ditch the staggered wheels if buying new wheels and tires. You can then rotate your wheels and your full treadlife warranty will be in effect for the tires. If you go staggered, the companies cut the warranty in half. So your 30k treadwear warranty becomes 15k. On a current S, even more so with a Plaid, it could pay for itself long term.