I'mnot sure about the NYC, but from the NSW cup these are the three best candidates IMHO. Any or all of these guys could become solid first graders if they are given the opportunity to become full time professionals.
Anthony Killingbeck (back-rower) could probably handle a bench role but is probably a year off being ready full time.
Jess Caine (centre) has played first grade before (at Souths) and would be capable if given the opportunity.
Ryan Verlinden (prop) is probably good enough for a game or two this year, but is still a step below Mannah and both the older guys (Norrie, Selmes) in terms of being ready to play on a week to week basis.