I always liked having heavy armor as a cleric. To me, being a cleric is all about defense. The cleric is about wading into the midst of the fray to reinforce the line, hearten your allies, and tend their wounds.
In 3.5, you could get a cleric's AC in the high 20's by around sixth level with the right spells, feats and gear selection. To me, there's just as much fun in wading through a horde of orcs unscathed as there is in inflicting tremendous damage.