I would like to suggest that all of the classes that already have the elemental damage reduction enhancements receive them all at once, the same reduction as a Monk receives.
For those who did not know, Monks receive an enhancement that reduces ALL elemental damage by two points - Way of the Clever Monkey - one action point cost for the first tier (apoligies, I am unable to link today for some reason)
http://compendium.ddo.com/wiki/Enhan...lever_Monkey_I
All other classes that receive an elemental damage reduction must choose one element - for the same cost that Monks pay to receive a damage reduction to all elements.
So - why is it that Barbarians, Rangers, and Rogues must pay five action points for the same thing a monk pays one action point to receive (add, this is a stacking damage reduction bonus)?