Emp (L), Sidious, Ani, Vader, RG.
Lemme share the logic. Sidious can apply up to 3 dots when u omega his aoe. 3 more that Vader can cull after he applies all his debuffs...up to 4 when omega'd. Pretty much ensures a 5v4 real fast. Ani gives everyone offense up, Sid applies 3 dots, Emperor stuns, Vader applies up to 4, he can potentially cull 8 debuffs away. When omega'd, that's +400% damage. U could drop a RG or SF if u have Vader modded for extra crit damage and he crits.
Plus, imo it's cool to run 2 versions of Ani and 2 versions of the Emperor.