Billy is offski, Marley 50/50 but I doubt he will stay.
Meekings, Ross and Raven I'd retain. All three are key players and there contribution will be even more pivotal if we face a bit of a rebuild.
Polworth has done nothing to convince me he is worth a place in the team and the fact he barely makes it onto the bench says it all - time to bin him. Same with Horner, hes no use.
Devine by the summer will have been here for 2 and a half years and while he looks decent he's never been able to break up Warren or Meekings for any length of time. If he values his career I would imagine he will move on in search of games. Though were Meekings to leave I'd get Devine signed up.