That is my Stamina set, I have have a Threat and a Avoidance set.
Along with what you see I have Waistguard of the Risen Knight and Tattered Castle Drape.
We are entering into Naxx, it'll be a while before I see Gluth or Four Horsemen.
We are killing Sarth though, so gloves I've got a good shot at.
So, looking at badge options I see:
Chained Gorget (its an upgrade, but how much?)
Living Iron - I think we might do instructor and since I have the other two, is it really worth it?
Shield - Not a huge upgrade, I'm also running HCoS
You'll see I have the Bracers of the Dalaran Parapets. I'm not opposed to spending gold when needed, or badges. However I'm just trying to be smart in my decisions. I don't have badges by the hundreds and I don't get to do a lot of heroics. I'm avoiding 2 different gear sets (Fury/Prot) this time around as it got to be such a pain in TBC.
I decided to get the Crygill's Shield. I did up a comparison on WoWhead and found that Crygill's was the same as Royal Crest +33 Dodge Rating (little lower in defense) I haven't had problems staying above the defense minimum, so I went with it.