Frankly, I wish I had bigger wheels. Bearing in mind the difference to the look of the car (and the amount of attention attracted) from 17s, 18s would be brilliant. The daddys and Andys cars both look great on 18s, and imho the wheels dont look too big, in the way that I think they sometimes do on cars like 206s and Corsas.
But as you rightly pointed out, the whole modding things about individual taste. And much the better and more interesting the scene is for it. Personally Im not a fan of huge, gaping meshed protruding valances or crazy flip paints, but many people love these touches, and I can appreciate what theyre doing. Each to his own I say.