After all the nerfs to purple elites i'm finding this a decently efficient way to farm legs, and some Gold/XP.
Chest is 100%
Find Bounties requiring you to "Clear" The second level of a cave etc. (Resplendent Chest is guaranteed on level 2 of these bounties)
Run through avoiding mobs, and loot the chest.
Generally i use act 1 and 2, then just restart the game.
Running on torment 6 the chest very often drops a legendary.
These boots are a big help - http://us.battle.net/d3/en/item/illusory-boots-29WYI0