Headlight bulbs needed - recommendations/tips

[HPsauce]

This evening my drivers side bi-Xenon bulb failed and I got the warning in the cluster - didn't notice at first as the car is pretty mucky, though I did hear the beep!
First time in 15 years of S8 with HID ownership that a Xenon bulb has failed on me!

I'll probably replace both as they've been pretty slow to warm up for a while and losing power, but what do people recommend? I want OEM colour temperature, not anything whiter though brighter would be fine. I'm expecting a hefty bill.
At the same time I'll probably replace the supplementary main-beam halogens - what are they and what do people recommend as brighter and whiter? They're probably 2002 OEM so pretty pathetic by modern standards.
Finally, how difficult a job is it and any tips on making it easier? I did replace the main-beam halogens on my PF S8 and it was a nightmare job requiring removal of ballasts, airbox and sundry other bits, hopefully the FL is easier. All I've ever done on the current FL is replace the sidelight bulbs.

So that's 3 questions, in summary:
1. Recommended OEM colour bi-xenon bulbs for a FL D2.
2. Recommended supplementary main-beam halogens
3. Tips and techniques for replacing them