I like Selene, but she never really seemed like a team player to me. She very much has her own, self interested agenda.
Maddie I would like to see get a redemption arc that ultimately leads her to reclaim a life of her own, away from the X-Men/superhero antics. She can show up to help kick Sinister's ass though.
So my Sisterhood would be:
Mystique (leader)
Destiny
Frenzy
Lady Mastermind (Regan)
Tempo
Risque
Unuscione
And they would basically be an extremist mutant rights org.