20s for the Demon - how low can I go? (big wheel haters don't look)

Ok this is a Nova we are working on at the shop. We're doing the interior work and glass. It has 20s on the rear and 18s on the front. The car has air bag suspension on it and the first pics is with it lifted then towards the bottom it is with it lowered (parked). This is a high end build here going on. Much money has been sank in her.

Now I like the way this car sits with the 20s on the rear and 18s up front. I don't think it would look as good with 20s all the way around. To me it wouldn't what you think?