I would at least look at the Divine Champion (FRCS or Players Guide to Faerun). Basically, they get some healing ability (for followers of their divine patron), they can smite infidel (basically, an equivalent of smite that targets worshippers of other/no gods, rather than an alinment aspect, and a few other powers.
I've toyed with removing paladins completely, and just using the Divine Champion class, instead.