The only extensive parsing I can remember happening with agility (I'd love to see more if someone has it) was from Coprolith and he reported that for every 100 agility you add before you get to 200 (i.e. 80agi to 180agi) you would see your avoidance increase to result in taking ~3% less damage.
So getting an agility buff is wise if you're not at the maximum number of buffs but gearing for agility is a pretty bad idea.
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