I was a bit disappointed by "Face to Face" and it probably is the weakest Bergman I experienced along with "Smile of a Summer Night" but - that maybe sounds strange - it also was the most interesting work by him I've seen so far. I think, he splitted two very different parts of his own personality up to Liv Ullman's and Erland Josephson's characters, some things of the young Bergman to Ullman and some of the elder Bergman to Josephson (Although I only know the most important facts about Bergman's biography). But this is only a suggestion as this was the first Bergman that left me a bit undecided.
I haven't seen the three Francos you commented on within the last months (though I'm sure, "Dracula, Prisoner of Frankenstein" isn't that crappy) but I can only recommend to you the early films he made between 1962 and 1971. This was the most interesting and the only brilliant period of his career (the other two - 1972 to 1982 and 1983 up to now - are mostly worse than bad) and "Eugenie de Sade" is only one piece from a whole bunch of interesting films - but the only one along with "Nightmares comes at Night" (1970) and "Venus in Furs" (1969) that operates as a serious work of art and not "only" as an odd but enjoyable psychedelic Freakshow.
Anyway, Franco really is a weird phenomenon. The most weird thing happened when A told me a few days ago that he would like to see much more by Franco. 

Which Sirk films did you watch up to now? I'm anxious to discuss his work with somebody - it seems as everybody has seen one or two of his films but not more and after "Written on the Wind" I became so greedy to see more that I simply grabbed as much as possible.