It looks like you got some good information here.
It took me a little while to switch over to the HID's, I figured I don't ride at night too much and it was not worth it, boy was I wrong.
If you have the extra cash, invest in a HID. I did both High and Low (5k) and in my opinion all I needed to do was the low beam. I also wanted the low temperature ones (5k) to keep them closer to white light. The higher the temperature, the further away from white they get and less usable light for good night vision (just my opinion).