I agree to just wait for projectors.
As well, this is something that can wait for all of us I think. It will be cheaper, easier and safer i think if we wait for someone to bring out a projector at least.
But, if you can't wait and want to spend more money. I did a small amount of poking around and found this on another forum, I hope that is ok, if not please let me know.
There is information and a link to a forum for just HIDs. This gives you all the reasons to wait and all the ways/reasons to do it right if you cannot wait.