I was using Kitana / Scorpion / Mileena and Raiden... but lately that has changed a little:
1 Kitana
2 Ermac
3 Smoke
4 Mileena
I never even liked Ermac and Smoke in any of the other games. Im still playing the others, but not as much as before.
I am also trying to get a Sindel and Sheeva going.