Man, I'm a brenton, and I have the lord stone, so I have 50% magic resistance. So the dragon priest were cake to me, I already got 5 mask. Look for that lord stone as it will add 25% magic resistance.
.
But if I was you, i'd stack up on magic and elemental resistance potions and enchanted gear.
.
Those work wonders in keeping you alive.
.
Also, bring some summoning scrolls and summon them in front of the priest face and the priest will attack your summon so that will give you time to get in as many hits as possible.
.
The tactic about using magic draining potions and weapons dont work as their attack is from a staff, not from them their mana. Draining their mana wont do anything to stop their attacks.
.
If you got the ICE FORM shout, USE IT!!!!!