If I enchant a creature with multiple auras with totem armor and my creature is destroyed, do I choose which aura to destroy instead? Do all the totem armors die? Is it the most recent aura first?
I think you pick one maybe
Yes. I was right. Check out the rulings on {bear umbra}
http://gatherer.wizards.com/pages/Card/Details.aspx?multiverseid=198304
Right. Totem Armor is a replacement effect (you can tell from the "instead" in the text). Whenever you control multiple replacement effects trying to replace the same event, you choose the order in which they apply. In this case, you have multiple totem armor effects all trying to replace "destroy this creature" with "destroy this Aura and remove all damage from the creature." After the first one goes off, you have "destroy this Aura and remove all damage from the creature," which further instances of totem armor can't replace, since that's not what they're looking for.