anything above 5000k is illegal. And any HID at all in a halogen reflector housing is illegal, regardless of color temp. With those projectors you are best off getting 4300k, they are the brightest and easiest to see
PS theretrofitsource.com has designed a retro-quik system for the spyder lights so you can drop a MiniH1 projector right in there to replace the old one. Should be released this week. That is for sure your best option