Very nice summary ... Initially I was (and most likely still will) go pure cleric ... but then I learned that True Sight gives mobs blindness immunity and there are a lot of scenarios where champions will have true sight, thus I am considering 17/3 split with either paladin or fighter . Outside of the obvious bonus hp and con, Paladin AP go to positive spell power while fighter AP go to hp ... the self gaining hp maybe necessary. Also while I usually went Scion of Plan of Fire for increased crit chance across the board and PRR/MRR ... maybe Scion of Celestia is better not only for the slight increased crit damage compared to scion of fire, but the bonus hp's again.
Most likely I'll make a pure build and LR or feat swap it a couple times to see which is most fuitful and survivable. I do like playing the healing build that requires on the edge skills.