Caster's shield of choice?

In pvp, I always see casters using a shield. After messing around with Guru's "calculators", I saw that a shield with 10+al vs. a specific damage type and an armor+5 weapon, you can reduce tons of damage. Since pvp players can only make one shield, I was wondering which one mods/bonuses they usually take......thanks.

i would say maybe en extra energy mod for the shield. but I'm not a PvP person so i have no idea.

Umm there is no extra energy mod for a shield. Also, if you don't meet the requirement for a shield, you won't recieve all of the armor bonus (you only get like 3 or 4 armor then).

The better choice is a caster offhand with a +45 health while enchant and -2 damage while enchanted inscription if you are looking for survivability in PvP.

Either a max shield or a no-requirement 8 armor shield.

+30 Health unconditional.

+10 armor vs. slashing (since you face primarily sword/axe melee characters).

The +45/-2 is nice, but makes you very vulnerable if you get shatterred/stripped.