Priest

Major

• Glyph of Circle of HealingLevel 50One more target for your best group heal: essential.
• Glyph of Prayer of HealingLevel 30Your other big group heal gains healing over time: essential as well.
• Glyph of Guardian SpiritLevel 60Cast before a big hit on the tank, Guardian Spirit comes back in 1 minute if it was not triggered.

Minor

• Glyph of ShadowfiendLevel 66Get mana back if your Shadowfiend dies before it expires.
• Glyph of LevitateLevel 34No more feathers to carry for Levitate.
• Glyph of FortitudeLevel 15Less mana spent buffing the raid, especially in combat.

Other choices

• Glyph of Flash HealLevel 20To save mana if you cast Flash Heal often.
• Glyph of Shadow ProtectionLevel 30Needs recasting less often on the whole raid, when this protection is useful.