$300. is rather on the cheaper side.. A good price for some quality zenons is around $400.-$500. for lights and Ballasts. I just bought another set of Philips Ultinon's 6000K for my foglights and they ran me about $600. with shipping.. Also, you have projection headlights, right?? With those you need D2S bulbs, those are for Projection housings.. For the reflective housings you'd use D2R bulbs.. Now that's just the type of bulb, you'd still need to figure out what size.. The 2nd gen GS's use 9006, I'm not sure what size your's will be..