Chris Chase-Dunn's top 10 books in world-system theory would be my top 10 too.
All excellent choices. However, I might also include the three volumes of
Immanuel Wallerstein's essays, all published by Cambridge University Press:
THE CAPITALIST WORLD-ECONOMY (1979), THE POLITICS OF THE WORLD-ECONOMY (1984)
AND GEOPOLITICS AND GEOCULTURE (sometime in early 90s).
I might also immodestly suggest chapter 6 of my SOCIAL TRANSFORMATIONS
(Blackwell 1995). It surveys a great deal of the literature and situates
world-system theory within the context of a more general theory of social
evolution.
Stephen Sanderson