Planning on going to Argentina last two weeks of March. Suggestions on a itenerary?

I am planning on going to Argentina for the last two weeks of March and looking for suggesstions on where to go. Leaning towards going to Buenos Aires, Mendoza, Iguazu Falls but looking for suggestions. Is this a good time to go as well? Any suggesstions on how to get cheap airfares from NYC and also hotels would be helpful. Thanks.