Dark side right now is the best way to go for arena. Zader has been my favorite for raids. Zaul is likely the best for arena but depends on your sid and EP. zQGJ is good for p1 but not really necessary. zBariss is interesting but not meta right now. Zid is needed for raid with Zader but not much as a primary.
Personally I agree with all the above but would go Zader although as stated above I worry about what the "change" will bring. May want to lay low for another week on that.