from what i researched, anything over 6k is for looks and not gaining, but loosing light.
"normal" look is 4000-5000 range. 3000 is yellow, 4000 (or just above) is probably maximum white light output, 5000 may look a little cleaner without a significant drop in light output, 6000 will be noticeable bluish, and start to reduce the amount of light you'll see. As for the 8000+ range, I'm not sure its a true number anyway, but its more if you just want something really blue/purplish, and there will be a significant reduction in how much white light you'll see.
although, i would love to have 3000 as well
BTW, pteam, did you notice that your passenger side flickers and then turns on, before the other one even has any lights?