Prot war ring choiceFollow

So i've been tanking a while and gathered quite a assortment of rings and was wondering what the war tank world thinks would be my best choices for the MT of a gruul/VR/Mag guild progression wise

elementium band of the sentry http://www.wowhead.com/?item=28407

shermanner great ring http://www.wowhead.com/?item=28675

Violet signet of the grand protector http://www.wowhead.com/?item=29279

Shapeshifters signet http://www.wowhead.com/?item=30834

Adal's signet of defence http://www.wowhead.com/?item=28792



I am waiting on 7th ring of tristfallen to drop just no luck yet ><

I use the violet signet and the shermanner great ring for tanking. I was looking at the stamina on the items for my set.

for evasion tanking or tps tanking (where your already over geared), the other items are good too. the shapeshifters signet is nice for tps... and has high agility, which is good for tps and avoidance/mitigation.

I didn't realize they changed it to expertise from the specific weapon skill, i'm gonna have to pick that item up and rotate it in.