Best CR. PVE

So i was wondering what best CR is out atm for PVE?.



Im LF,Hunter,Paladin,Warrior,DK,Druid,Monk atm



I was thinking about buying tuanha full CR but it does not show numbers it should be in my opinion. Atleast not on the DK version. So wonder if i could get some information about current best CR's

Best CR. PVE