The first comic I ever subscribed to was the Justice League of America. Unfortunately for me, it was when the League had a fairly crappy roster including Vibe, Gypsy, Vixen, and Steel. Fortunately, it was cancelled a few issues later and replaced with Justice League International.
JLI made comics fun again. Blue Beetle and Guy Gardner provided the laughs with Batman playing the ultimate straightman for their jokes. And we can't forget about poor hen-pecked Mister Miracle either.
This book collects the formation of the JLI at the hands of Maxwell Lord and goes up until they get the International status and Martian Manhunter becomes the leader. Fun stuff. For a lot of people, the Justice League is the Big Seven. For me, it's the roster the League had at the end of this book.