Spell Hit:
The unmodified spell hit cap without any modifications is 446. Various talents will modify this value. In all cases, you can take off 1% (27 rating for spell casters) if a Draenei is present in your party, due to Heroic Presence. Furthermore, you can take off 3% (79 rating for spell casters) if a Shadow Priest provides the Misery debuff or a Balance Druid provides the Improved Faerie Fire debuff.
Modified values:
Physical Hit:
The unmodified physical hit caps without any modifications
are
Dual-wield auto attack: 886
Special attacks and auto-attack: 263
Various talents will modify these values. In all cases, you can take off 1% (33 rating) if a Draenei is present in your party, due to Heroic Presence.
Modified values for special attacks:
I was unable to find any modifier for paladins and feral druids, so their cap for special attacks is 263.
Because it bears mentioning, two additional values:
26 expertise (about 214 expertise rating at level 80) to negate a
boss’ dodge chance,
60 expertise (about 492 expertise rating at level 80) to prevent parries
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