Try to find a balance between warranty lifespan, price, and RR. The cheapest tire might not be the cheapest at first. For example $41/tire for a 40,000 mile tire is more expensive than a $56/tire 80,000 mile tire in the long run. I always read through the reviews, it really helps to hear from actual owners of the tire, they will talk about road noise and any complaints they have.
As far as size goes I would stay at the stock size. You could increase diameter to lower RPM's on the highway, but the impact is minimal and usually bigger tires cost more. You don't want to go any wider as UltArc stated.
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