What pieces are preferable if I can't get the Ashran stuff (both 6.1 and 6.2)
Go to Ashran and don't join any raid. Look for the closest enemy getting gang banged and stay near him without casting any spells or doing anything (not like you gonna even tickle them with no gear, so...) and start milking your mouse right button at his almost corpse. You'll most likely get the loot depending on your latency. Many times you'll get a piece of enemy's body too together with artifacts, which will give you tons of rep and you don't need to roll for the pieces. Pretty much just be a scumbag.