Of Mice and Stats 2

General
DPS Melee Yellow Hit Cap: 5%. The min needed for special moves (shown in yellow combat text) to not miss.
DPS Melee 2-H or 1-H Hit Cap at level 85: 8% requires 961 Hit rating / 841 for Draenei,
DPS Melee 2-Weapon Hit Cap: Each Spec that can DW has a talent that alters the amount needed.
DPS Melee Expertise Cap: 5% preventing dodges when behind the target.
Tank Expertise Cap: at level 85 is 26 Expertise – requires 781 Expertise rating. That would push dodge/parry completely off the table.

Spell Hit Cap: 17% will make you able to hit a level 88 boss with 0% misses.

Ranged Hit (Hunters): 961 hit rating (or 841 if you are Draenei)

Tanks: Your goal is to reach 102.4% avoidance (from dodge, block, parry) to push normal hits entirely off the roll when you are hit. This is not possible with current gear.

Sometimes gear is about looking good and sometimes its about thumping things.

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Stat weights
Ive kept them very general. I prefer to know that spirit is better than crit rather than that spirit is 1.5 better so 30 spirit is 45 crit when comparing. That gets a bit much even for me.

Classes
Death Knight
Blood
Mastery > Dodge = parry > Hit = Expertise > Crit = haste
Frost Dual Weild
Strength > Hit to Cap> Expertise to DPS Cap > Mastery > Crit >Haste
Frost 2-H
Strength > Hit to Cap> Expertise to DPS Cap > Haste > Mastery > Crit
Unholy
Strength > Hit to cap > Haste > Mastery > Expertise to melee cap > Crit

Druids
Balance
Intellect > Spellpower > Hit = spirit to spell hit Cap >Haste > Mastery > Crit
Feral – Bear
Agi >Mastery > Crit > Hit = Expertise > Haste
Feral – Cat
Agi >Mastery > Crit > Haste > Hit = Expertise to DPS cap
Restoration
Int > Spellpower > Spirit > mastery > Haste > Crit

Hunter
Marksman / Survival
Agi > Hit = 2 AP > Crit > Haste > Mastery
Beastmastery
Agi > Hit = 2 AP > Crit > Mastery > Haste

Mage
Arcane, Fire, Frost
Int > Hit to Cap > Spellpower > Haste = Crit > Mastery

Paladin
Protection
Mastery > Parry > Dodge > Armor > Expertise > Agility=Str
With 8% bonus spell hit only aim for 8% DPS melee hit cap.
Retribution
Str > Hit(to cap) > Expertise (to dps cap) > Haste=Mastery > Crit
Holy
Intellect > Spellpower > Haste > Spirit=Mastery > Crit

Priest
Shadow
Int > Spellpower > Haste > Crit = Mastery > Hit/Spirit
Note: You can no longer clip dots.  Your pet inherits your melee hit rating, useful for mana/dps.
Holy and Disc
Int > Spellpower > Spirit > Crit = Mastery = Haste

Rogue
Note Spell hit is used for poisons.  Hit needed with 3/3 Precision for: Yellow- 241, spell- 1127, White- 2523.
Assassination, Combat
Agi > YellowHit > Expertise > Haste > Spell Hit Cap > Mastery > Hit Cap 2-wep>Crit
Subtlety 
Agi > YellowHit > Spell Hit > Mastery > Haste > Expertise > Crit > Hit Cap 2-wep

Shaman
Elemental
Spirit/Hit (to spell cap) > Intellect > Haste = Mastery > Crit > Spirit
Enhancement
Agility > Hit (to spell cap) > Expertise > Mastery > Crit > Haste > Hit > Intellect = Strength > Spell Power
Restoration
Intellect > Spellpower> Haste > Spirit > Crit > Mastery

Warlock
Affliction, Destruction
Int > Hit (to spell cap) > Haste > Crit > Mastery
Demonology
Int > Hit (to spell cap) > Mastery > Haste > Crit