I like the bigger 17/18 wheel look on our cars, however to be honest. I'm not a huge fan of the chrome 17s that are on your car, just not quite my style. I think the 15s fit the car better, but some different style 17/18s can also work well.
Since it seems like you are concerned with tire height, my 18s total diameter is 28.5". So I wouldn't say you can't have a tall tire with a larger rim, just have to size it right (295/45/18). Tall/Fat tires on bigger wheels can look awesome
Can try on some Bullitts if you ride to Florida!! Definitely enough tire height here