What are the best vacation spots in South America for a couple with a moderate budget?

Cupcake asked:


My BF and I (late 20′s) are planning a trip to South America. Rio de Janeiro is ideal but we want to have other options . What are some other locations that have great beaches, a great night life, great food, shopping, culture, and beautiful sights all rolled up into one. We have a moderate budget so we are trying to plan as carefully as possible to make the most of our $. So if any one has any suggestions on cities that possibly match the above description please let me know…Also, any info on the best time to travel, hotels (under $200/n), and discounted airfare would be greatly appreciated. Thx :)

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