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The stock diameter for our 986 front tires is 25", so out of those two choices 215/45/17 is the closest but still under, and 215/40/17 is shorter. If you go to 225/45/17, it is right at 25", same diameter as the stock 205/50/17 fronts. I am running 225/45/17 fronts on my Boxster. They look better and in my opinion they handle better, better grip up front and less understeer, and if you are looking for performance tires (which you say you are not) it really opens up a lot of choices are there are very few 205/50/17 Extreme Summer tires.
When I was in Charlotte, NC I had Max performance summer tires on year round, and the guy I bought the car from in PA also ran Max perf summer tires all year, and drop his jeep to work if it was snowy/too cold/etc.
I'm not sure what the weather is like in TN in winter so I'm not sure what would be best for you. But in NC I never had any trouble, if it was snowy or super cold I just took my Tacoma. Now I am in FL so it is barely ever below freezing.
Edit: If you want to run an A/S, the new(ish) Michelin Pilot Sport A/S 3 is supposed to be very good, several folks on here run that tire.
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