Buy the correct housings and do it right, you will get the best pattern.
The projector will offer a better pattern than just putting a kit into a standard housing but the HID projector is not the same as the halogen projector so it will make glare and not the best pattern. Up to you if you want to do low and high, factory only low is HID.
If you do choose to just jam an HID kit into your lights don't go above 5000 and 4300 is best, buy it from theretrofitsource.com for a decent quality part.
Apart from pulling out the lights how do I know if I have HID or Halogen projector? 07 full options,and if I do have HID then I assume it just a matter of changing bulbs, no need for ballast or in line resistors I know stupid question!
The city light(yellowish, why it comes on with headlights on I have no idea) the main lights come on, auto level out and are white. Yes they take a couple secs to brighten, I also read the option of headlight washer came with HID, and I have the washer. So if I do have HID then all I need is the bulb and no ballast. I want to upgrade to 5000k.