My Grand Prix has some of the most pathetic headlights I've ever experienced. Best combination for my car was some Catz "HID" bulbs that have a kind of rainbow color tint to the glass, but illuminate a crisp, bright white color similar to that of a white LED. I scored these on eBay and haven't seen another set since. They're different in that the end of the bulb isn't painted over like most others...It's the same as the rest of the bulb so light can shine thru it as well.
I also removed the metal diffusers in the headlight capsules (an ongoing debate amongst GP owners whether this is worthwhile or not) and it made them better yet.
Oddly, I had to re-aim the headlights from where they were with other bulbs. They were off a ton! Shined about 5 feet in front of the car. Must have the filaments placed differently than a regular 9007 is all I can think.
If I ever trash one of these, and can't find a decent replacement, then Silverstars will go back in, since these were next in line for being decent for my car.