Holy Paladins are the Tank healer, they can maintain both tanks alive by themselves with big heals, and still help with raid healing.

Stats for Holy Paladin Wotlk

Stat priority

 Intellect > Spell Power > Crit > Haste > MP5

Holy Paladin Stats Overview

Intellect

Increases the mana pool, MP5 (Replenishment) and crit, and it scales well with other buffs.

Spell Power

Spell power increases all the healing done.

Critical Strike

Each critical strike returns 50% of the cost of the spell, this reduces the amount of MP5 required, while increasing the healing output.

Haste

Haste increases the speed of the casts, no spell cast can ever go bellow 1 second because of the global cooldown.

MP5

MP5 stands for mana per 5 seconds even while casting, however as mentioned above critical strike refunds 50% of the cost of the spells, reducing the value of MP5.

Notes

In lower tier gear, Flash of Light will be the go to heal, as Holy Light is more expensive and slow to cast, towards end game Holy Light becomes better by far.

Stats Breakdown without increasing effects

33 hit rating ≈ 1% to hit

33 expertise rating ≈ 1 expertise

33 haste rating ≈ 1% haste

45 critical chance ≈ 1% critical

1 stamina ≈ 10 Health

1 intellect ≈ 15 mana

1 agility ≈ 1 attack power

1 strength ≈ 2 attack power

1 critical chance ≈ 84 agility

14 Armor Penetration ≈ 1% Armor ignore