City University of New York (I attended the Baruch College branch) provided a really good set of teachers at a really affordable price. I and a lot of other people supporting themselves were able to put myself through college at night. The school is famous for its business program (esp. the accounting major), but I found exceptional teachers in all fields, from statistics to literature and music.
This college targets older working professionals and international students - so there's a decent age and cultural mix - which really helps the diversity of discussions.
