Changing tires won't affect the warranty for the rest of the car at all, as long as you keep the sizes the same as the factory tires. The only thing affected would be the tires, and your new ones should have a warranty of their own.
I would be a little surprised if there is a big difference in price. The all-seasons should actually be a little cheaper, so for the most part, you should only be paying for mounting and balancing. It might benefit you to shop the tire prices on your own before having the dealership swap them. Never hurts to be well informed before making the deal!
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'74 Stingray coupe, heavily modified, as seen in August 2011 VETTE magazine, 2014 Stingray Z51 #196, ordered 02/11/13, built 08/29/13, Museum Delivery 10/04/13, driven daily!
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