I would say Exploration of the Gamma Quadrant. Not in a alien of the week fashion but as in explore the dominion more and the other races that make it up and what makes it tick and is the dominion fighting any other wars in the gamma quadrent? Could thagt be why they did not instantly poor through the Wormhole after the romulan and cardassian attack and instead focus on destabilising the Alpha/Beta quadrant power first?
Could have fit the borg in there as like the federation there is a good chance the dominion is under periodic attack.
The others seem good....except the benny russel one.....please I had enough of him any more and it would have ruined my fav Startrek series.