Is not bad the build, but if were me, i donīt waste 5 points in seal of righteousness, because a retri pala donīt use that seal very much you always use seal of command. Also, you need equip that increase your critical strike rating at least at 25%, then raw power, a lot of strength also, and a good slow two handed weapon.
For a protection one, a lot of stamina, and a little agility for the evation, also you need equipment with defense rating, and spell damage, all the points are in the protection tree but is good to save 10 for a deflection in 5, the extra parry rating is handy, this is the pala more difficult to gear up, because you need to balance the defense, blocking, dodging, and parrying so that you become uncrushable, the sum of all must be at least 103% (is a little less but i donīt remember the number).
About the Holy, donīt know much, but intellect, and healing are must be, and is good a shield, and a one handed weapon because you will be using seal of righteousness and is better with a quick one, your mana pool must be large, and also your spell criticals.
I hope this will be useful for you.