To get padme, you'll need sep droid or geos. And taking a look, I think you may be able to get Padme with your geos. Then you just gotta decide if you want to gear up padme and her team (which you should, some are already at G12) or go for Drevan. Personally I would get padme, gear her and jka up and then move to either sep droids or drevan.
Droideka kills two birds with one stone, getting a BH ship needed for the M iL F (forget which one, think its Cad's) and ya B1 is gonna be a long one. But every farm is pretty much slow and painful. The path of least resistance for you seems to be gearing geos, get padme, gear them, then decide between DR and Sep Droids. BUT if you want the sep droids the most, go get em.
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I could put in thrawn, but unsure on who the 5th should be. If I go this direction I suppose I'd start grinding sith empire trooper
I have a terrible habit of not finishing gearing squads in this game haha