Tayrel, Sepulcher Sentinel and Sinesha would be the highest priority imho. 

Then you'll also want to 6* Apothecary, Coldheart, Frozen Banshee, Astralith, Fayne, Psylar, Vergis and at least one out of Rearguard Sergeant, Grizzled Jarl and Sandlashed Survivor - order to be determined by what you need most at the time. Bellower and Soulbond Bowyer maybe as well. 

I'm  glad  someone  has  actually  recognised  Fayne  as  a  valuable  champ..  i  really  like  her,  sure  she  has  very  low  defense  but  her  kit  is  absolutely  awesome.  

Fayne is very good for CB, but she's very squishy. She works best on unkillable or block damage teams.

SS is an amazing CB champ all around. She's definitely a good choice. Ditto for FB.

I can't tell glancing through your list, but if you have any champs that have leech, especially on A1, they'd be good choices too.