Dragonstorm breastplate and the valorious chestplate.

I've been contemplating this for a bit and have ready access to either of them, here be the stats.

Valor chest
iLevel 213
127 stam
100 strength
2298 armor
65 block value
46 defense
53 block rating
yellow socket
blue socket
6 block rating socket bonus

Dragonstorm
iLevel 213
127 stam
111 strength
2298
44 defense
37 dodge
58 parry
red socket
yellow socket
9 stam socket bonus


With Valor there is
65 Block Value
2 Defense
53 Block

With dragonstorm there is
37 Dodge
58 Parry

threat is really not much of an issue at the moment, and I would be keeping the 2 set bonus from the shoulders and legs, is the avoidance worth the loss of block rating/value?
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http://www.wowarmory.com/character-sheet.xml?r=Bloodscalp&n=Akairos
Progression tanked: (2/3 spider, 2/3 Plague, 3/3 Military 2/4 Construct 10/25)25naxx and all of regular naxx, sartharion+010/25, Malygos 10

Dragonstorm = TEH AWSUM<3 ..imo.
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Depends on what your tanking.
As you said threat isnt much of an issue, however avoidance will always be somewhat, the less dmg you take the better right?
Dragonstorm is the best avoidance chest out there and its really good for MTing.
If the boss hits for +6k (unblocked) id say avoidance > BV, thats just a rough estimate made by myself, but thats about where i draw the line. That basicly includes all Dragons and... and... thats pretty much it
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"It's difficult to work in a group when you're omnipotent."

Situational gear is... Situational.

Get both

Dragonstorm for MT job.
Valor chest for trash/AoE.

Get the dragonstorm first, since its a competetor for best in slots.

Having an excuse to get valor chest after getting Dragonstorm is much more acceptable since its "omg" t7.
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"ready access", as if dragonstorm EVER drops >.>
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Armory

In my current gear, which includes the hero's chest, I have 26% dodge, and 16% block, I am concerned about dropping my block rating to low, I had that issue in BC. >_>

edit: Upon reading Elsie's post, I might go for dragonstorm.
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http://www.wowarmory.com/character-sheet.xml?r=Bloodscalp&n=Akairos
Progression tanked: (2/3 spider, 2/3 Plague, 3/3 Military 2/4 Construct 10/25)25naxx and all of regular naxx, sartharion+010/25, Malygos 10