There were two that immediately jumped out at me as my having to nominate them, and a half-dozen other possibles, so I'm just nominating the two:
PP428: When It Ends, He Catches Her by Eugie Foster, read by Tina Connolly
PP455: Turbulence by Scott R. Jones, read by Siobhan Gallichan
There were many good stories this year, but for me, those were the best of the best.