Shadow priest revolves around managing DOTs on the target and has a rotation that close resembles that of an Affliction Warlock.

Stats for Shadow Priest Wotlk

Stat priority

11% hit cap > Spell Power > Haste (1350) > Crit > Spirit > Intellect

Shadow Priest Stats Overview

*Hit Cap

For a caster the hit cap is 17%, with 6% from [Shadow Focus]&[Misery], 11% is the hit rating necessary to hit with spells.

Spell Power

Spell power is the best stat for a shadow priest after hit, the spell power will increase the damage output of the spells, this will be even more beneficial as haste and crit increases.

Haste

Haste reduces the global cooldown by a small amount and increases the speed of the casts, after 1350 the cast time will be below the Global Cooldown, and there is no more reason to add more, has the Global Cooldown will never go below 1 second.

Critical Strike

Critical Strike increases the chance to do a critical strike and do double damage.

Spirit

Spirit increases the mana regenerated and spell power by an amount superior to intellect.

Intellect

Intellect increases the mana pool, spell power, and the critical strike chance, however, most of this stat will come from the gear itself.

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 chance

1 stamina ≈ 10 Health

1 intellect ≈ 15 mana

167 intellect ≈ 1% critical chance

1 agility ≈ 1 attack power

1 strength ≈ 2 attack power

1 critical chance ≈ 84 agility

14 Armor Penetration ≈ 1% Armor ignore