Going to do fire mage glyphs since that is going to be the primary dps spec for pve. Mages have some tough choices depending on your group make up and what you are doing but in a raid enviroment these would be the top choices and they will vary by group make up.
- Glyph of evocation This also restores health along with mana
- Glyph of improved scorch. This glyph allows you to only cast 2 scorches and have the max stack instead of 5
- Glyph of mage armor If you are having mana issues this is a great one increase the amount of mana gained by 20%
- Glyph of mana gem this is a great one increases the mana gained by mana gems by 10%
- Glyph of Molten Armor 2% additional crit….. if you dont need mage armor 2% crit is nice
- Glyph of Polymorph this glyph is for all you mages who run with dumb ass warrior or locks who have to hit anything moving or whirlwind near a sheep to keep up on the dps meter. It removes all dots from a target.
- Glyph of arcane explosion 10% reduced mana costs if there happen to be big AOE needs like hyjal was
Good luck in your choices and keep the others laying around i am sure there will be a time and place for all the glyphs….