I'd second the Uruguay option (full disclosure; I've moved there!)
For an idea of what it's like, a long-time expat from Wales has a great guide; guruguay.com.
An added plus is that Montevideo is one of the best airports in the world. Small, friendly, efficient, quick. A much more pleasant way to arrive in South America than EZE.
Iberia usually has 2 business class Avios seats available if you book far enough in advance.