For a 16 inch wheel you will want to go with 205/55/16 or 215/50/16(very limited options)
For a 17 wheel you will want to go with 215/45/17
As far as extra costs, there shouldn't be much. Depends on the wheel you get, you might need new lugs($20). If there is a discount store near you, buy them there, do not buy them online. If they don't balance the wheels correctly, then you would have to pay someone else to do it. From my experience, the wheels hardly ever come balanced correctly. Also, I wouln't pay the extra money to have that special thing done to the tires. I don't think it is nessecary for your needs. Just make sure they balance them correctly. So, buy them from the store if you can, and your extra costs should be minimal. If they don't balance them right the first time, have them keep doing it again and agian to they get them right. Also, tell them to take the .25oz margin of error off. You shouldn't have to pay for them to do it right. Good luck
