suddenly i have discovered about armor cap for druids :

75 % melee damage reduction at 60 mob lvl: 17648 armor
75 % melee damage reduction at 63 mob lvl:: 21855 armor
75 % melee damage reduction at 70 mob lvl:: 31673 armor
75 % melee damage reduction at 73 mob lvl:: 35880 armor
according druid wiki website :
http://druid.wikispaces.com/Druid_Game_Mechanics#toc11

but i am not sure about bosses much higher than lvl 70 , any ideas ?

personally i have about 34k armor .

bosses count as being 3 levels higher than you.

damn i got a shitload of gearing up to do, at 27k now. sucks.

Thanks shead