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Playing on Frostmourne (Naxx)
Between
Essence of Gosamer
https://wotlk-twinhead.twinstar.cz/?item=37220
Valor Medal of the First War
https://wotlk-twinhead.twinstar.cz/?item=40683
Defender's Code
https://wotlk-twinhead.twinstar.cz/?item=40257
Are there 2 that I should always be using which are better than a third?
Are there combinations that are situationally more useful against certain bosses?
Generally speaking for tanks, effective health is preferred over avoidance. This goes especially for bear because of how stamina scales. I'd say get Essence of Gosamer and Defender's Code for general purposes. Valor Medal of the First War is more of a situational trinket for cases of tanking many enemies at once.
I'd go with http://wotlk.cavernoftime.com/item=37220 and http://wotlk.cavernoftime.com/item=40257 though not sure if that's the best combo.