I'd happily jump into a patrol on any of these, but my top pick would probably be the reef. We have a social space and the prison, but there's really no where to go in the reef which makes a large portion of the asteroid belt. We could get more insight on the queen since they still have confirmed her dead, the scenery would be among some of the best in the game, the awoken could become a new enemy race as this is where they originated from. Not to mention it would be interesting to see how they would give mobility to a desolate wasteland of basically platforms and asteroids.