Hey there bro, how are you?
I just got your mail, so as your question about the language in Latin America.
Let me tell you this first...
Mexico must be your first option. It's just incredible.
There are thousands and thousands of foreign people living here now.
Of course is important to learn spanish. Must of mexican people doesn't speak english, but in Mexico City you can survive with English and the main things to say in spanish.
Actually, im a very good spanish teacher.
I've been traveling a lot and i know how does it feel and i know your concerns.
So, if you need any help, contact me.
It would be also nice to meet new friends.
Facebook: Adrian Montes Ferrer
Take care. And Welcome to my city.