Hey man - great questions...
-CR123s do it for me and even in africa I could always find them (no offense to any afrikaners reading ) - with that said, I want to bring one AAA or AA just in case... Even though I know I can find CR123s in most places in Europe and I'm already planning to have my better half bring me a fresh SC2 when we meet up in Greece - which is about midway through the trip.
-yes yes yes - this always happens and thanks for bringing it up! I can guarantee SOMEONE will need a light. I'm meeting up w different people throughout the trek and I can pretty much guarantee they'll ask for a light. This is where I'm thinking a maratac AA or AAA comes in handy - dont want them f'in up a surefire
A loaner/gift light or 2 is a must
Beyond that I'd just bring the Ra, Quark MiNi 123 Warm (battery carrier/back up light), ARC (maybe) and the Minimus
You can get cr123s everywhere and a few cr123s will last a long time. In an emergency a cr123 will set you back about $7-12 in most European stores.
Enjoy your trip!
Sverre