I've done pretty well at 1500 lately with this:
Librarian in Terminator Armor
3 Terminator Squads with AC
2 Terminator Squads with Cyclones
I generally start with either just the Cyclones on the board and DWA two of the three AC squads or leave all in reserve and DWA the three AC's. All depends on what the mission and opponent are of course. Librarian also adds a little more MC, Warboss, and lash defense. Getting hellfire off occasionaly isn't bad either.