So far this is what I'm considering: http://www.worldofwarcraft.com/info/classes/paladin/talents2.html?tal=50302000000000000000000000503000000000000000000000000052300513020313532120#none

Dipping into Ret for Sheathe of Light, which turns 30% of my Attack Power into Spell Power as well, AND throws a HoT on a target I get a crit heal on (which I can force with Divine Favor).

Then, grab Divine Strength and Imp. BoM to further increase my AP which will ALSO increase my SP.

Now I need a huge fuckin' 2-handed mace with lots of +str and +ap and run around screamin, "you see this maul, you see this maul!!?? I'M HEALS BITCH!!!"