Hi guys:
I am enjoying your updates on South America.  I liked Buenos Aires, especially the tango show! did you get a chance to take one in? Your description of the traffic chaos was right on.  In addition to the traffic chaos, our friend was mugged on one of the street corners and had his watch ripped right off his arm.
Ushuaia was interesting to us also.  We enjoyed strolling the little streets and did take a tour of the national park.  It does resemble Banff!  When we were in Ushuai, we met a young fellow working there, who was from Calgary!
I look forward to all your future postings.
Take care and have a safe trip.
Shona