Looks like you like the Jedi and have some progress there.
I would go for Zeta QGJ lead, Yoda, General Kenobi, Jedi Knight Anakin, R2-D2.
JKA is farmable from Cantina nodes and some hard nodes.
GK is from heroic AAT but it is a lot easier to get into a HAAT guild now if you can guarantee your 600 tickets daily.
R2 is legendary event like Yoda and should return in a couple months. (You need Empire characters to unlock him)
In the meantime, you could substitute in other Jedi such as Ahsoka who has a little synergy with JKA.
You'd also need to start working on 5 Dark Side ships to 4* asap to unlock Executrix and prepare for Zeta challenge.
