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).
The eBay kit I bought for one of my cars was junk. I went thru 2 ballast before sending it back for a refund. VVME is like $50 shipped and worth it. They back anything up. My wife's Camry is running the kit I had from my accord. The ballast are like 7 years old and still no issues. Had to replace the bulbs though once. But heck once in 7 years is pretty dang good.