I'm not that big on using spells, but Spellbreaker's ward effect has saved my butt more then a few times. That plus the Elemental Protection gives breathing room when fighting dragons.
With the "Ward Absorb" perk in Restoration, blocking a spell with Spellbreaker's Ward will actually replenish your Magicka, at no cost.
Between Spellbreaker's Ward, Elemental Protection, 40% Resist Magic, 80% Frost Resist and 30% Fire/Shock Resist, hostile magic is an absolute joke to my Nord Warrior, even an Ancient Dragon's Firebreath on Master. The only magic that i've seen reliably break Spellbreaker's Ward, is Shock spells.