What enchants can I get for my gear?

Head/Legs
Arcanum of Focus (+8 dmg) - Dire Maul Quest
Hoodoo Hex (+10 sta, +18 dmg) - Zul'Gurub Quest

Shoulder
Zandalar Signet of Mojo (+18 dmg) - Zul'Gurub Quest
Power of the Scourge (+15 dmg, +1% crit) - Sapphiron, Naxxramas

Back
Subtlety (-2% threat) - 4x Nexus Crystal, 6x Large Brilliant Shard, 2x Black Diamond
Greater Resistance (+5 to all resistances) - 2x Lesser Eternal Essence, 1x Heart of Fire, 1x Core of Earth, 1x Globe of Water, 1x Breath of Wind, 1x Ichor of Undeath

Chest
Major Health (+100 health) - 6x Illusion Dust, 1x Small Brilliant Shard

Wrist
Superior Stamina (+9 sta) - 15x Illusion Dust

Hands
Shadow Power (+20 shadow dmg) - 3x Nexus Crystal, 10x Large Brilliant Shard, 6x Essence of Undeath
Fire Power (+20 fire dmg) - 2x Nexus Crystal, 10x Large Brilliant Shard, 4x Essence of Fir

Feet
Greater Stamina (+7 sta) - 10x Dream Dust

Weapon
Spell Power (+30 dmg) - 4x Large Brilliant Shard, 12x Greater Eternal Essence, 4x Essence of Fire, 4x Essence of Water, 4x Essence of Air, 2x Golden Pearl

To look up a quested enchant, simply do a search for the enchant's name at http://wow.allakhazam.com or http://www.thottbot.com/ . There are also miscellaneous resist enchants for several slots, which I didn't include. For a full list of all the enchants in the game, go to http://www.wowwiki.com/Enchanting_by_Item .