I did a cheap, but very nice upgrade of the existing valance. Ditched the fog lights and grafted in two brake duct scoops ($19 on eBay).
And then I made a grille in the middle, using a rear deck lid grille. Looks way cooler than the original, but at the same time it is original... Give the car a more agressive look, without the RSR or Ruf style valances that are so common.