My new car has Xenons. They are really great, but they also have an autoleveling setup to keep from blinding other drivers. This seems to work pretty well, as I am driving I see the sharp cutoff line always staying right below people's rearview mirrors. I don't think the DOT will ever approve them as aftermarket, for this reason.
Hella H4 conversion housings with 130W bulbs work just as well. I have one on my motorcycle with just a 55W bulb and the light is pretty nice.
