If you can track it down, I highly recommend Morrison/Millar's Aztek. 10 issues, not traded, pretty hard to find, but worth it. It sets up some of what happens in the World War 3 storyarc(which I actually enjoyed a lot; Morrison's never been great at endings), and gives background on the character.
If you want more of Waid's JLA, Tower of Babel was my favorite arc of his. I actually didn't like Divided We Fall much, though seeing Hitch do the JLA was definitely a fanboy dream realized(albeit briefly).
