I agree with Project 2501 that American/U.S. culture is an excellent idea, personally

I'm not sure what your access to scientific literature is, but if you're looking towards more "indigenous people" which have been well-documented regarding your topic, I'd suggest any Native Americans, Australian Aborigines, New Zealand's Maori or perhaps the Bushmen (San/!Kung/etc) of South Africa.
While I like the suggestion of Tibet you made in the first post, it might be that a lot of research is focused on politics and their relation with China which you would, indeed, have to sift through.
Other ideas... mh, the Dinka in Sudan, Maasai in Kenya or Quechuas (they comprise several ethnic groups actually, but often classify themselves as one) or Yanomamö in South America. Perhaps even Bedouins.

Although my knowledge is limited, with some of these you could possibly even argue a sort of/slight transition from B to A with the transition from subsistence-oriented economies to cash crop cultivation, but that might be getting too deep into the topic =)
Anyway, these are just a couple of things that came to mind.

Edit: The suggestion of the Ainu made in the Chit-Chat thread is definitely an interesting one too =) And as far as Sear's suggestion, you could consider modern day Scandinavia, which isn't too far off anything else "western" or you could look at the Saami people in that region.

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