Trinket help?

Alright, finally got most of the trinkets I need, except for the +111 stam one in AN (CURSE YOU AZJUL'NERUB). Anyway, im having a lot of trouble picking which two out of http://www.wowhead.com/?item=37872 http://www.wowhead.com/?item=40683 and http://www.wowhead.com/?item=36993

Without http://www.wowhead.com/?item=36993 i still am uncrit, so which would be the best combo?
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Will either combination make you block-capped?
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Kieras <- armory
Proud cook of Savory Deviate Delight

yes
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I think you'll have to swap for each encounter here, as they're all kind of separate.

Maexxa and similar bosses with burst-damage you need to survive: seal and valor. Those two combined make a very fine panic-button, and the seal is overpowered for stun-situations (no block/dodge/parry, relying on miss)

Lavanthor's provides a lot of mitigation, but no avoidance. It's absolutely awesome for gimick-fights (Loatheb) and trash, but other than that I see it more as a threat / meatwall / migitation-trinket.

On most bosses I'd go seal and valor however. You might take more damage overall than with Lavanthor's, but you're always getting topped off by more than one healer anyway, so those 400 damage isn't all that much. Both seal and valor provide some pure avoidance which might actually save you, and an awesome panic-button in addition.
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Kieras <- armory
Proud cook of Savory Deviate Delight