Frost Emblem Spending Question

So, I figured out my aggro problem thanks to you guys so I thought maybe you wouldn't mind weighing in about my Emblem Spending.

My current armory link is:

http://www.wowarmory.com/character-s...f&cn=Ivandeath

I also got the thumb yesterday: http://www.wowarmory.com/item-info.xml?i=50235

I will hit 60 Emblems of Frost Tuesday, so my question is, should I spend the 60 badges on the Corroded Skeleton Key Trinket for the 228 Stam or should I hold out for the 95 Badge 264 Tanking Chest?

I would also welcome any alternative gear suggestions, but please note I know that the dual slow dps weapons are needed and I am working on farming them. I do heroics and my guild is just starting 10 man raiding and we will probably never raid 25 man content. Tankspot ROCKS!

Thanks
iVAN

The biggest advantage I saw in taking the chest (which I did) was that the huge amount of expertise gave a degree of freedom in chosing subsequent upgrades. The Skeleton Key does not do that; it will be my final upgrade I think.