let's see... for one last wave i'd go with:
Alan Scott/ Solomon Grundy
Martian Manhunter/ Two-Face
Donna Troy/ Kyle Rayner
Red Son Batman/ Red Son Green Lantern
and two box sets:
Doom Patrol (Robotman, Crazy Jane, Rebis, Joshua Clay with clear orange hands)
and
New Gods (Mr. Miracle, Big Barda, Orion, Darkseid)
then the series would be PERFECT.