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

17s just look to small on a Demon or Duster. I love the CCW Classics on the green duster. The only way 18 and up look good on a Duster or Demon is if the car is lowered and both the front and rear wheels are tucked some. Other wise the car just looks like its sitting to high.