I want a mixed faction.
I would take the Radiance, the Halcyon, the Discord, the Illuminator, the Garda, the Orgov, the Marza, the Akkan, Skirmisher, the Jikara, the Jarun Migrator, the Antorak, the Enforcer, Iconus, the Karrastra, the Serevun, and the Sulsurak.
Probably have mixed same-classes in there, but you get the drift.
The opening sequence of Rebellion suggests the possibility of a mixed faction later... I'm guessing when the x64 Sins2 is released.