To be fair, I think it really does depend. Are you raiding or grouping? What class are you talking about? SKs have lots of innate procs that lifetap and offset damage being taken, so in the group game I believe fed gets the nod. I know I've gone full hDex (as much as feasible) and my SK is f'n awesome (he's also admittedly very decked out in chase items for non-vis stuff. I'm wearing EoK group armor for visibles.
With that said, I went hAgi and hSta on my warrior.
well i feel ac is not a factor, as you dont have a choice, not like you can get ac aug 5, as far as i know, so you are stuckj with whatever they give ya on items that do have ac.
War: AC -> H.Agi -> H.Sta -> H.Str (if tanking with shield)/H.Dex(if Dual wielding)
this is my personal experience, running a tank through all of eok progression with a zerker and shaman support.
and yes i dual wield on him most fights, cause its so good dps wise, but you lose mitigation, is why dex can help with evasion and more dex is more connecting hits or some such, i forget.
now for paladins and sks, since they dont dual wield, but some of their damage and defensive stuff comes from procs, maybe balanced dex and str as they often are shield bound wiht massive damage dealing 1handers.
again all this is from personal experience playing all 3 classes.