Agree. J. Michael Straczynski’s Babylon 5 is a masterpiece.
some books were written in the same universe by others. The “during the series” books are so-so. But then there were 3 trilogies that are brilliant compliments to the Babylon 5.
The Psi Corps Trilogy written by J. Gregory Keyes.
The Centauri Trilogy written by Peter David.
The Technomage Trilogy written by Jeanne Cavelos
http://en.wikipedia.org/wiki/Babylon_5_Novels,_novelizations,_short_stories,_and_comic_books
I’ve read the last two books in the Centauri Trilogy, and skimmed through the last book in the Psi-Corp Trilogy. What I saw, I liked.