well from what ive read 4300k has the most actual light output and its white with a very slight hint of halogen yellow, 6000k is a crisp white and 8000k has a blue hue in it.
now, i ordered a vvme kit and they goofed and sent me a 6000k bulb and a 4300k bulb and i can barely tell a difference. if i were to pick, id buy a 2nd 6000k bulb because i like the look more. im just too lazy to take off my tire and wheel well again