More knowledgeable folks will be able to help with offsets, but in general you never want to go more than +2 meaning 19s max.
If you are on the base model suspension - which I assume you are with 17s - then the wheel gap will be pretty noticeable with anything larger than 18s, so you may want to consider and account for a slight suspension drop to close the wheel well gap.
I have the sport package which lowers about an inch from the factory and the gap is perfect with the sport 18s.
Jimbo
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