How much Hit Rating do Priest need to stop missing with spells?

Q: How much Hit Rating do I need to stop missing with spells?

A: Here are the Hit Rating values for level 80 Priests. If you have a Draenei in the party, use the second number in [brackets] instead. (You can always calculate special cases by hand; just remember it takes 26.24 Hit Rating to equal 1% Hit at level 80.)

PvP

Base - 105 [79]
Misery or Imp. Faerie Fire on target - 27 [0]
Just Shadow Focus - 27 [0]
Debuff on target + Shadow Focus - 0

Raid Bosses

Base - 447 [420]
Misery or Imp. Faerie Fire on target - 368 [342]
Debuff on target + Shadow Focus - 289 [263]

(Death Knight Understudies will require 158 [132] Hit Rating for reliable Shackles.)