Invest in a set of foglamp protectors and headlight protectors, ~$50 for a pair each. Back in September 2007 I had a stone flick up and smash one of my headlights, $270 for a replacement from Subaru!
Mine have saved me from smashed lights several times over since.
A quick theft of images from RS25 forums...
You can't even tell they're on the car at first glance.