I have the Eibach Pro Kit springs and Anti-Roll Sways with the factory GFX kit and have had ZERO scraping issues. Love the feel of the car on smooth roads, feels like my Corvette did on the bumpier roads.
I got a hell of a deal on the kits that can not be matched (got them at a charity auction) and install was $350 and that included the alignment. Pull the trigger and you will not be sorry.
Edit: The kit actually drops the car about 1.2-1.3" both front and rear. It gives the car the look it deserves. Love my ride height and haven't zero regrets.