I think everyone has their gut feeling about what bike they want to ride, or what sort of style, so it's very much personal choice.
You mentioned the availability of parts possibly being a factor, if push comes to shove (and it has on occasion with me

)and you need parts, there are usually several options, if original parts are not available:
a)sometimes local alternatives are used - I had something out of a Toyota once, and parts from Russian cars fitted on my BMW.
b) you'll find that in the more remote areas, they tend to repair rather than replace, sometimes these repairs won't last a long time but enough to get you to a major city.
c) final resort you can just get the parts sent via DHL to wherever you are in the world.
I got a part sent out to me in Outer Mongolia last year.
Good luck and have a great trip.