Volume 1
Orion 1-25
Showcase 94: The Joker (New Gods feature written by Simonson)
Secret Origins of Super Villains (Darkseid and Granny Goodness feature)
The New Gods Secret Files and Origins (Simonson pencilled portion)
Uncanny X-Men and New Teen Titans
I have this down as a future bind but as 2 volumes. Other material that could be included are:
DC Universe Holiday Special/Bash ‘97 1 (Highfather Christmas),
Secret Origins of Super Villains (Granny Goodness),
and Legends of the DCU 80-pg giant 2 (Carnival in Armagetto).