Shield for PvP

So I was recommended to get shields for every element / dmg type and now I have the inscriptions.
I was wondering if I should put them in req 7 15 al shields or should I take the penalty and just put them in shields with the skin I like?
Or better yet, just have 2 focii and use Man of All Seasons / Survival of the Fittest?

EDIT: (btw, this is for a caster not sin <-- :P)

req 8/9's wit 16 ar imo... with +10 arm VS everything

If you use tactics stances grab R7/8 tact shields with +AL vs xxxxx and +30hp.
If you dont, grab whatever R7-13 shields of any attributes with +AL vs xxxx and +30hp.

You don't need evey element just elemental and maybe one versus hexes.It would be tactics if playing Sin.Warrior would be str.

Please read the OP's post again. "(btw, this is for a caster not sin <-- :P)"

If you don't meet the req of shield, you get half the armor rating.

So if you're putting this on a caster, just grab any shield you like the skin of. You'll get 8 (assuming you got max armor from the shield; 16) plus 10 vs. element/damage type from the inscription.

http://wiki.guildwars.com/wiki/Shields

I would recommend this one a for a castor.

http://wiki.guildwars.com/wiki/Jacqui%27s_Aegis

I got one of those for my Monk.