By popular request, i've finally taken a decent set of pictures of what should be the 3 rarest original Xbox consoles. You'd be suprised how hard it is to take a photo of transparent plastic with a reflective metal backing...
In no particular order, they are:
Hello Kitty Xbox
EA Employee's Xbox
Launch Team Xbox
If I had to guess most-to-least rare, it would be Hello Kitty --> EA --> Launch.