first off all you'll never get beyond 2k dex anyway. id say that most monks will never go beyond 1,5 k
second. Armor has a lower Itembudget than Dex. so comparing them 1:1 is not very sensible either.
third: dodging is simply not solid because not everything can be dodged. and on some hits i dont want to rely on dodging in the first place. If iam in Inferno Belial and i have the choice between 50% editional EHP through Dodge or through 50% more EHP through AR / Resist
I would always go for the AR / resist. you simply cannot rely on dodging every time. and you cannot stack it well. and even though it might scales lineary and not logarythmic like AR and resist. the Dodge ranges you describe cannot be reached .... dex is just not good for stacking evasion.
In Inferno you get bombarded with a ton of elemental dmg which cannot be dodged even if you had 100% dodge...
i guess its good because every monk at 60 has around 700-1200 dex and thus ~24%-32% extra dodge a barbarian would never want to accumulate.but thats already it... i think making an effort to stack Dodge beyond using the Dodge Mantra. is a waste of affix-, and skill- slots; as far as bang for the buck is concerned.