Here's an idea: There are three catergories of ants you can choose from: Solenopis Invicta, the Red Imported Fire Ant: Which is known for it's dangerous workers armed with chemical and physical weapons, L. Humile, the Argentine Ant, used for it's fast rate of producing workers and queens to have satelite nests and high work effiecency, and some new Pheidole sp. from Chernobyl or Cambodia, used for it's ability to produce super major that can act as tanks, workers with sawlike mandibles to harvest food faster, as well as other specialized castes. Really, RIFA and Argentines dominate in this world, but having a third party, especially one that draws heavily from Pheidole's ability to produce it's different castes, would be interested. While ponerines have cool looking jaws or whatever, they don't conquer nearly as much territory as the invasives. I think you should stick to invasives only, since they are the most powerful.
solenopsis invicta - warriors/fighters
Pogonomyrmex's - famers
ect . . . .