In the 51/20/0 spec and well I'm unsure of how to go about gearing it. First off I'd offer to give you an armory link but I'm still in my prot spec on that so its kinda useless for this purpose so I'll just list what I've done.
245 Triumph Helm
4 piece 232 t9
Protector of Frigid Souls
Splintered Icecrown Parapet
Oath of Empress Zoe + Heartmender Circle
Love's Prisoner
Sunforged Bracers
Tears of the Vanquished + Talisman of Resurgence
Plate Girdle of Righteousness
Recovered Reliquary Boots
Titanforged Cloak of Ascendancy (Just cause I couldn't get the drops available in heroics, they just weren't dropping)
And finally Libram of Veracity
-Everything is Gemmed int with the exception of one nightmare tear for the meta (Insightful Earthsiege)
-Everything is enchanted with sp
This roughly means I have around 29k manapool, 424 mana regen (340 while casting), 10.1% haste, 2.3k healing and 28.4% crit completely unbuffed (if I am wrong don't shoot me, thats all by memory). So is this enough to raid yet? Or should I go pick up Seethe (which drops crit but gives me bout a 100 spell power boost and increases my mana pool further)/Cloak of the Fallen Cardinal (it'll lower my sp but increase my crit/mana regen) first?
That being said how should I upgrade from there? If raiding is indeed an option at those stats, I can see getting a Pride of Kor'kon and such immediately but in terms of trinkets what are the Holy Paladin upgrades? And on the note of upgrades would you drop the 245 helm for a 232 t9 in order to switch the legs for Corrupted Silverplate Leggings?