I know that some quests with "named" end rewards give you a much larger range to choose from on every 3rd completion of that quest, such as the quests in the Red Fens. I think one of the Inspired Quarter quests does as well? (Do Three-Barrel Cove quests also show you all the named loot the 3rd time?)
Is there a list of all the quests with named end rewards that give you a better selection the 3rd time you complete it?