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Well I think gemming for agi is always better than defense or dodge because of crit for threat and savage defense as well.
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If you want avoidance, agi is your best stat anyway; assuming kings, agi gives more avoidance point for point than dodge rating does.
On SD and the value of strength, crit, haste and AP: The value is exceedingly low. To give an example, using the best case scenario for SD (no overwrites, no buggy behavior) which gives about an 80% uptime on shields, and using one of many of the Ulduar bosses, 100 AP gives approximately .1% mitigation. In virtually all cases 100 armor would be better.
Crit rating would in theory be the best of the lot, but because of overwriting and the bugs associated with SD it becomes far too unreliable to stack.
Sadly, SD is essentially a non-entity in gearing. It gives around 2-3% mitigation with 6000 AP and 40% crit, and there's no real way to functionally improve that so much that it will help.
As for the arena weapons, they're hugely and laughably overbudget. They'll be nerfed shortly.