Well, I know this is a long shot, but this is what I would like to see for Spacedock:
Jem'Hadar Prototype Battleship
Borg Tactical Cube
Borg Diamond
Borg Sphere
Modern (2360-2370s) Tholians
Modern Gorn (Particulary some data on Narrow Wave Disruptors)
The Dominion War source book pretty much covers the Breen and Dominion for me except the Jem'Hadar Battleship.