Heres what I like to do:
I usually go DS, my party leader is HK-47 (I know you cant choose him as party leader, but I use him that way anyway) with Dark Jedi Atton and Dark Jedi Bao-Dur.
I really enjoy using some powerful Carbonite Projectors on the Sith Masters, incapacitating two of them, and have Atton and Bao-Dur pick off the third with upgraded double lightsabers(I just keep alternating between freezing the other two, then it becomes a numbers game.)
Just my personal preference