clawhammer's first post should have /thread. because thats all you needed to know.
4300K is the win. absolute best option for most output. 3000K is good but is more suited for foglight applications. everything else is ricer city. normally i wont hate on stuff up to about 6000K, but even that has a tinge of blue starting to show. i preach it all the time but i never understand why people want 8k, 10k, 20k stuff... but i guess they think its better than what they got?
i also recommend a full retrofit (isn't cheap) if you're wanting true light output, over a kit, as most halogen headlights with hid "kits" in them are not designed for it, and can cause glare and horrible cutoffs (as seen in clawhammers post).
get those 8k's but dont get pissed that im flashing my brights in your face because they blind me worse than a lifted chevy with his fog lights in my fac coming head on.