Hands down the Darkmoon Card: Greatness is the best for ret paladins.
But what about second trinket? For pve I was thinking Fury of the Five Flights or the 2 trinkets in ulduar that give hit rating/procs of 1200ish AP, due to all the gear in Ulduar being armor pen/no haste not much hit, so the hit would make it so I didnt have to socket hit in every gem almost, plus burst is fun.....