Well, we gem for stam and try to get armor from items.
In most cases you just have to decide between extra armor or extra avoid. You only have to decide between armor and stam when choosing your trinkets. And those are trivial to swap. If you have alternatives, that is.
The once per minute absorb is propably nice. But when you get hit by a boss then there will be hit another time. He won't wait until your minute is up.
Armor is with you and stays with you. Armor will hold your hands during the darkest moments of your typical encounter.
It's actually very easy to have 30% avoid even with the ICC debuff. So I wouldn't worry about that.