Yes, you're correct. Stack agility, hit, expertise and crit. Here's Sejta, main tank and guild leader of Paragon:
http://eu.battle.net/wow/en/characte...e/sejta/simple
Notice that his chest has a 300 stamina enchant, along with two critical strike rating gems, meaning the chest piece is used for tanking.
This is also good news: "A hotfix will be applied to adjust how Vengeance stacks for tanks of all classes: Vengeance should now ramp up more quickly. Avoidance will now grant Vengeance based on the average damage of the avoided NPC auto-attack, instead of just refreshing existing Vengeance. This does not apply to enemy special attacks."
Keep up SD and /win.