Retrofit is a pain. I did it to my accord and ended up selling the head light assembly because I got black housing headlights.
No need to run HID on high beams or fogs. Im running 6000 k high beams from one of my dealers at a speed shop, Standard 9006 bulbs. Im running standard h4 bulbs on my fog lights too, I think they are 2500K (nice yellow, awesome in fog).