Well, the trip looks like this:

Fly into BA, spend day in town

Fly up to Iguazu and come back the next day to BA

Fly to El Calafate for a day, then on to Ushuaia for 2

Fly back to BA

Fly to Santiago for 2 days of skiing - sightseeing

Back to BA, and back to the US.

It certainly leaves room for a future trip to Argentina. While I use BA for a transit point, I don't plan on spending too much time in the city proper. I don't enjoy big towns and the crowds for the most part. I'm more interested in breathtaking scenery.

I'm planning on renting a car in Iguazu, El Calafate and Ushuaia, but not in BA.