i would say just keep the stock size tire, 165/55R14, since your car have no modification. maybe upgrade on rims, look for wider rims, 5JJ? 5.5JJ? 6JJ?

it's possible to install 15" rims also, either 165/55R15 or 175/50R15. afaik both of this size have not much of choice compare to the size 14". i would recommend don't upgrade to 15" as your car have no modification.

don't think this size is available... or even if available, it's an odd size, not much of tire choice.