An optimal raid setup (and almost all setups are nearly optimal now) gives you:

Raidbuffs:
+3% damage (Sanctified Retribution, Ferocious Inspiration)
+91MP5 (Blessing of Wisdom)
+5% crit chance (Moonkin Aura, Elemental Oath)
+5% spell haste (Wrath of Air Totem)
+144 (or more) spell power (Flametongue Totem, Totem of Wrath, Demonic Pact, Improved Divine Spirit)
(+1% hit chance if you are alliance and have a draenei in your group.)
Stat multiplier 110% (Blessing of Kings)
+64 (or more) spirit (Divine Spirit, Fel Intelligence)
+48 (or more) intelligence (Fel Intelligence, Arcane Intellect)

Self buffs:
Fel Armor: (180 + 30% spirit) spell power
Flask of the Frostwyrm +125 spell power
Bufffood: 36 spell power for the "normal" bufffood.
Professions: Two "good" professions will give about 38 spell power each, so this is another 76 spell power.
Demonic Spellstone: +1.83% haste plus the dot improvement.

Debuffs:
+13% damage (Curse of Elements, Earth & Moon, Ebon Plaguebringer)
+10% crit chance (Improved Scorch, Winter's Chill)
+3% Crit taken (Totem of Wrath, Master Poisoner, Heart of the Crusader)
+3% hit chance (Improved Faerie Fire, Misery)