matecocido: I agree about the imbalance between natural sciences and humanities (or, as the Germans used to say, "sciences of spirit" --Geisteswissenschaften unite!)
I have similar options to choose from (vacillating between UChicago and Yale now), but can say that Princeton seems to be dominated by undergraduates, though there is some fantastic research going on there. Not quite related to your concerns about academics, but I've heard that the graduate student housing provided by the university can be unsatisfying (basically a big dorm with a bar in the basement).
Berkeley seems to have some great people (Martin Jay in intellectual history, Judith Butler of course, though she's teaching part time at Columbia and may stay there permanently perhaps, etc), and I've always found their designated emphasis in critical theory really attractive (the designated emphasis system itself is pretty unique, I think, comparable to my knowledge only with the many interdisciplinary committees at UChicago). I can also totally agree, at least according to my impressions, that Berkeley has an amazing strength in things medieval. I got to know an Oxford-trained medievalist in the English department and she was incredibly kind (totally contingent fact that doesn't expose a pattern or institutional strength, I know, but perhaps a useful tidbit?), and Niklaus Largier in the German department is an expert in medieval German mysticism.
From what I've learned, Hopkins humanities overall is a very tight-knit community and the advising/mentoring one gets is amazing. The Humanities Center has some very renown scholars whose work is pretty cutting edge (Hent de Vries, Michael Fried, etc.), but not quite related to your stated areas of interest. In any case, it looks like a very positive and supportive environment within which to grow as a scholar.
I did not apply to Stanford and so didn't really research it, but I can say that one person working on Italian and German literature there, Hans Ulrich Gumbrecht, consistently puts out amazing scholarship (his pet concept is "presence"). More on the theory-side of the humanities, though.
Unfortunately, I don't have any knowledge about the UC system and am myself waiting for funding to come through from Berkeley.
Anyhow, hopefully these informations are useful in some regard! For late medieval intellectual history, I would go for Berkeley and, if funding fails to come through, perhaps try giving them the "your my first choice, but I have an offer with better funding, etc" line. If that doesn't work, maybe go with Princeton.
Good luck and congratulations!