I get a real kick out of a lot of these Santo films. They're just stupid fun for monster/superhero fans. Some of the "best" I've seen are:

SANTO IN THE TREASURE OF DRACULA
SANTO IN THE WAX MUSEUM
SANTO VS THE VAMPIRE WOMEN
SANTO AND THE MARTIAN INVASION
SANTO VS FRANKENSTEIN'S DAUGHTER

The biggest disappointment, unfortunately, was the most anticipated SANTO AND BLUE DEMON VS DRACULA AND THE WOLFMAN. Sounds fun right? Zzzzzzzzzzzzzzzzzz.