Really don't know about y'all but I prefer stacking armor to the moon on prot paladin.
All of my healers love me and want no other tank but me in the raids. The raids are always smooth as hell and I take no damage.
I stack armor up to 49.9k and just keep going if I don't reach the lvl 83 armor cap. Organ/PTS/Eof belt/cape, 10 man saurfang bracers, 4pt10, pillars of might, rs25 boots, rotface neck, onyxia ring + devium, etc.