I think it's going to take the vast majority of the next decade to sort out Labour's current situation. The next five years should be focused on trying to win back the working class vote, which the party has taken for granted for far too long. That and not electing David Miliband as leader in 2010 are, in my opinion, two of Labour's biggest mistakes in recent history.
My choices at the moment are Keir Starmer, Hilary Benn or Yvette Cooper. Nobody else really stands out to me, unless of course David Miliband came back, although I think it's very unlikely he will unfortunately.