There are very strong teams for P1-P3 of the Sith raid, leaving essentially NS as the team used in P4, which means Asajj lead zeta as the first one to do.
Go Asajj unique first, then the lead is preference. Talzin lead seems to be preferred for PvP, but i have had much more success with Asajj lead in arena. And asajj is generally the better raid leader.
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P4 Asajj lead. Zeta on Asajj lead. The others are real nice to have.