Some car warranties can be cancelled and have a pro rated refund available, look into it, hopefully you can do that
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Usually warranties are included in the loan so the refund goes to the finance company reducing the loan amount but not payment amount.
15's with the right tire will give the best ride and rim protection.
16's are a great option but limited to 7" wide wheels, there are some great wheels in 15x8 if you want wider tires highly recommended.
17's have limited tire selection as well as just get to tall in most sizes and the heavy stock wheels with short sidewalls will always ride rough, far more easily damaged, better to have a more reliable and comfortable setup that can make the car more enjoyable, handle better, less noise, less wear and tear on the chassis so 16's and better yet 15's make a great deal of sense for this car.
Pick tires based on actual measurements, not basic listed numbers as I have posted many times there are major differences in the actual versus real specs.
Not likely any 225 will be optimal on a 7" wide rim as not enough sidewall support can lead to less precise handling and more tendency for the car to roll over in aggressive or defensive driving situations. Wider is not always better, a well sorted out set of wheels and tires is the most critical mod we can do to our cars so take your time and research all options.
As always I will gladly help pick out what are the best options for your needs but need more info to do it well.
1)budget
2)intended use as in summer only, all season, winter tires, etc.
3)how soon you want to do this
Rick