This week is University Press Week. I am a huge champion of university presses and the books they publish. In a society increasingly hostile to education, one way you can fight back is to support university presses dedicated to the acquisition and sharing of knowledge!
UP Week includes a blog tour: http://www.aaupnet.org/events-a-conferences/university-press-week/university-press-week-2017/2017-blog-tour#Wednesday
You can keep up with news related to UP Week on #upweek. For tips related to academic publishing, I recommend @PrincetonUPress and their #AskanEditor series.
Oxford University Press is excellent
Yes! I also love Yale UP for relatively inexpensive but still very sophisticated nonfiction.