OP back for more advice. We've settled on a more fixed schedule and we're at peace with the fact that flights are ridiculously expensive

Aug 31 - Sept 7 (1 week) in BsAs. That will leave us one more week in Argentina (Sep 7 to 13). So we're thinking 2 days in Iguazu + 3/4 days somewhere else (Salta, Bariloche, Mendoza, Neuquen)

Of the other options, any stand out? We'd love to do some hiking so Bariloche seems ideal, but I am concerned about the weather in early Sept (and it is the most expensive flights). Salta sounds interesting for wine and hiking, but is it different than say Arizona / Anti-Atlas (Morocco)?

Another question... if we decide to fly back to BsAs (AEP) on the same day that we're leaving for the US (EZE), how much time should we allow for transfer between airports? We will only fly LAN, not Aerolineas.

Thanks!