Who are the best economists without a Nobel Prize?

Bob T., a loyal MR reader, asks:

Who are the best economists who did not win the Nobel Prize since its inception until today, e.g., Alchian, Tullock, Tiebout(?), and Barro?

I'll add Albert Hirschman and Anthony Downs to that list.  Who else?  Kevin Murphy is a tremendous economist, qua economist, although he doesn't fit the traditional Nobel mold.