You'll find that 4300 is still very much white. 5000 is white with very slight blue tinge and by the time you get to a 6000 it very obviously blue. Most OEM HIDs are 4300K AFAIK.

Unless you use HID kit with a projector lens you will get a lot of stray light and you'll find alot of on coming traffic flashing you.

Just from my experience.