This looks pretty good, although the mana cost for some abilities (Crusader Strike being the worst here) is too high for the amount of mana you get (100 points per day is nothing)
Also, with the current system, Meditation is useless, as the current mana regen is wis mod (which is nothing) per hour. That means that, with the most liberal interpretation (you take the mana regen for the hour and get half of that per round), you'd get half of your wisdom mod per round (which is pretty good), but if it refers to the amount you'd get per round, then you're getting 1/1200th of your wis mod per round, which is nothing.
As it is right now, the mana system is broken, and needs a rewrite. I'd recommend keeping the 100 (or reducing it to 50 + wis or int mod) and making it regenerate OOC at a rate or 5 + wis or 10. This makes everyone happy whilst still keeping Meditation useful for long battles.
Also, the retribution Spec is way too good for a 1 level dip. I mean, +20 % dmg (you need to specify if it's calculated before or after bonuses) is an immense increase, and if you don't want every 2hw user in the universe suddenly dipping paladin, you might want to change it.