I personally don't like bixenon. Some people (including myself) sell a kit that has a HID lo beam and a halogen hi beam which is more useful that bixenon IMO

35w is plenty bright, but you can get 55w if you would like

And most people will get either 5 or 6k for the color

But these are all personal choices. These are going on YOUR truck, so you are the one that has to deal with them all the time. Get whatever you would like best, not other people