I'm looking at a possible week to week and a half trip to Argentina around September timeframe. This would be my first time in S. America.

I would like to see at a minimum, Iguazu Falls and Tierra del Fuego (possibly using Ushuaia as a base).

Iguazu: Is one day enough to soak up the atmosphere, or am I selling myself short? I would probably try to stay at the Sheraton in the park. That said, is $300/night for a falls view room worth the money (in your opinion)? If only staying one night, I can probably stomach that room rate, but if one day is not enough to realistically see the area sights, I might reconsider.

Ushuaia: Is this a good city to explore the Los Glacieres Park, or is another place better? Expedia shows what looks to be a pretty nice hotel in the town (Las Hayas). I guess the Tren del Fin del Mundo is the best way into the Park? I would be looking at 2-3 days here.

Transport between would obviously be by air. I'm guessing AEP is going to be my major airport for intra-Argentina flights?

September: What is the weather going to be like during this month? Is the south of Argentina going to be snowbound at this time, or is this a pretty good time of year to go?

Any other tips, tricks or advice would be appreciated.