If your going to do it make sure you get projector lenses. Putting 6k HIDs in a housing designed for standard bulbs is a big no no as the light pattern just wont work as its not designed to have that sort of light coming out of it.
As long as you have these, I dont really have a problem with them. Might even get it done myself and get some 6k ones thrown in. Id beg anyone to spot the difference.