To me, the #1 priority is a RH puck moving defenceman, that is assuming Boro will recover nicely from his hernia surgery and be the decent #6/7 d man he can be. Ideally I'd like to see Ceci move down and slot to the 3rd pair, and if we can get a guy can pass and skate like Matt Niskanen or Anton Stralman, and Wier continues his play late in the season and playoffs, I think we would have the D-core to challenge the top teams in the East. It may sound like a stretch to some, a guy like that can take 22-23 minutes, and probably reduce EK's minutes a bit, and Ceci do not need to be exposed too much (I think he still has a ways to go before he can be that guy).
The forward group is mostly fine, plus Puempel, Prince, Paul, etc will push for spots. You can have a young, fast and skilled forward group, and score plenty to win games.