I would advocate picking up 5 points in ardent defender as soon as possible, its one of those abilities that has saved me from many a wipes.
Also deflection is a good one to pick up early on.
And pickup touched by light as soon as possble after 60.

devotion also helps healing for 6% which wont amount to much by itself but can add up in long boss fights.

"Seal and Judgement of light when combined can provide you with the MOST damage mitigation possable."
Dosent make much sense.

Majority of the time I end up using Seal of Wisdom due to the fact if yer outta power yer damage goes to shit the rest of the group catches up to yeh in aggro and pulls something off yeh.

And in 3.1 prot tree gonna change a lil
"Blessing of Kings is now trainable at level 20. Removed from talent trees."