I just ran across this and thought I would point something out.
If you increase the size of your wheels without lowering the car, you end up with way too much ground clearance and an overall bad look

. There is a Civic that I see everyday that's rockin 18" rims with a stock suspension, and it just looks plain stupid

. If you only want to put nice wheels and don't care at all for other mods (

), then you might want to consider keeping them the same size.