Joined: Jul 12 2012
With a 3k health pool fhr stops doing much, resists can be found other places, dmg reduction is meh for pvm, the only great thing about coa is the extra socket (assuming it spawned with 2 lol). It really is a judgement call between the socket and defense vs the +1 skills and life/mana, mf fhr and resistances aside.
If you want to get to 50% dmg reduction cap it will be har without coa or stormshield. And all these arguments assume your PvM. I don't PvP, so I can't speak to that.