I just got my 3 core sets and am looking for some direction. I played targ with 1.0 so I'd like to keep that as my main house. What faction do you think they have great synergy with or can they be good without a banner?

I hear good things about Targaryen Fealty. Dracarys! for free once per round.

Typically Targ go well as fealty. One of their more common bannered houses is Lannister because of the synergy between Drogo/Jamie and Tyrion/Illyrio/put to the sword.