Does no one see Broberg making the team next year?
Keith retiring makes it less more likely, but I still think he's more value as a call up and injury replacement vs. starting in a depth role on the big team.
Imo there's a few ways you can tackle the defence (I'm going to assume Kulak is back)
1) Keep Barrie, and run a high offence group
Nurse-Bouchard
Kulak-Barrie
Niemo/Samo/UFA/Trade-Ceci
2a) Trade Barrie, and bring in a cheap 4/5 via trade or UFA (think like Ian Cole, Ryan Murray, Srtalman or Maatta) to pair with a kid on the 3rd pairing.
Nurse-Bouchard/Ceci
Kulak-Bouchard/Ceci
With the bottom pairing being something like Niemo/Samo-Murray or Broberg-Stralman
2b) Or aim a little bigger and bring in another true top 4 guy (Manson in UFA or someone like Dumoulin via trade). Pairing them with either Nurse or Ceci and having the other babysit a kid.
Nurse-Broberg
Dumoulin-Ceci
Kulak-Bouchard
Nurse-Manson
Kulak-Bouchard
Niemo-Ceci