Música Nocturna, by Rafael Filipelli is such a great film... I'll be adding it to the site soon.
I´m glad to see a list dedicated to New Argentine Cinema, Arsaib. Out of the mentioned films that I've seen I would say that "La ciénaga" and "Historias extraordinarias" are the greatest, and might also prove to be the most influential. I suggest that you may also add the films by Paula Hernández ("Herencia"), Santiago Loza ("Extraño") and Ezequiel Acuña ("Nadar solo") who are among the most relevant contemporary Argentine filmmakers. While Inés de Oliveira Cézar´s "Extranjera" was an interesting though flawed adaptation of Euripides, her best film is likely "Cómo pasan las horas" which I would also recommend to add to the list.