I would recommend you visit other places in Argentina. Of course, Im partial in this advice but if you have visited EZE already, why not visit the North or South of Argentina?

Some destinations in the North that are must sees:

Salta, Tucuman, Jujuy... or Iguazu

Else in the South.....

Usuahia, El Calafate, Bariloche, San Martin de los Andes...

Nothing against the great cities of my hermanos latinoamericanos, but, unless you are checking off a list of countries visited, I would give a different Argentine destination some serious thought.