I usually have one or two series I watch regularly throughout a season. This time around it's The Good Wife and the Game of Thrones.
Elementary and the Mentalist are series I'll catch every once in a while but I don't care if I miss an episode or five. Modern Family and Community are my less serious series that again, I'll occasionally watch, but lately I don't find either of them particularly clever.
As for shows that came along in the last decade or so, I've watched: Prisonbreak, The West Wing, Sopranos, Law and Order, Law and Order SVU, Frasier, Friends, Big Bang Theory