If I were you, I'd go for Padme. You already have a good JKA, GMY, and Ahsoka; all you'd need is some gear on Padme and Kenobi to get a very solid team.
I just saw you already have Padme 6 stars. In that case, you're so close to having a great team with her. I'd put some work into gearing/leveling abilies for Nute Gunray. Under his lead, your Dooku and Ventress should be able to carry the event. Maybe put some gear into Magnaguard too, to make him more tanky for the event.
Then after that, relicing that team up would be a great idea - plus you've got good clones, so GAS could be a great long term goal if you want.
Or, you could get the Revans. That wouldn't be a bad idea, either. But your roster is more ready for Padme IMO.
Is it worth it to finish relicing my Nightsisters or should I leave them as they are?