At least get your facts straight.

Resto Druids only have a 20% damage reduction ability usable on themselves.

Discipline Priests have two damage reduction abilities, one has a positional requirement for 30% and the other can be used on anyone for 40%.

Holy Paladins both have target-able damage reduction ability with Hand of Sacrifice -- but note the Paladin transfers the damage to his/herself and the ability also has a damage-cap -- and they can use Divine Protection on his/herself for 20% untalented or 40% talented-magic only. Of course, they can also Divine Shield as well.