philips is good. Someone posted something about McCulloch or something on Group Buys section. You can do a search and find out. depends how you want ur ligths to look like. bright or colorful. the more color you get of ur HID, less brightness you get. higher the #K, more color after 6000K. i think 6000-8000K is the brightest you can get and 9000K looks like purple-blue thing.