I prefer 8000K and w/ a slight bluish tint, which I have on my tC. It comes down to personal choice. If you want a true white light, you can opt for a 4300K I believe. You may also want to check w/ your local state DOT laws on what is legal and what is illegal, if that matters to you or not. I will say this much, once you go HID, you won't want to go back to an OEM/Zenon bulb, the clarity is amazing, you'll see farther as well as more of the side of the road where dangers lurk. HID's will be really affective more so on back country roads where street lights are minimal.