Unlike other classes, all Mage builds (Frost, Fire, and Arcane) generally follow similar gear requirements. The differences are in what the mage is trying to achieve: Burst DPS (Spellcrit), Sustained DPS(Spellpower), or Utlity(INT/STA/Resiliance). All mages will want to mix these stats in their own way, and all builds will want to pickup at least some Spellhit, Penetration, and/or Mana5. It's for this reason that there is one build listed below with a general mix of stats which can be customized to fit your own particular niche.
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Main-Hand:
Blade of the Archmage
Blade of Wizardry
Eternium Runed Blade
Mana Wrath
Greatsword of Horrid Dreams
The Willbreaker

Off-Hand:
Khadgar's Knapsack
Lamp of Peaceful Radiance
Manual of the Nethermancer
Hortus' Seal of Brilliance
The Saga of Terokk

-- or --

Two-Hand:
Terokk's Shadowstaff
Bloodfire Greatstaff
Warpstaff of Arcanum
Auchenai Staff
The Bringer of Death
Ameer's Impulse Taser

Wand:
The Black Stalk
Nexus Torch
Nether Core's Control Rod
Nethekurse's Rod of Torment
Wand of the Netherwing

Helm:
Spellstrike Hood
Battlecast Hood
Mage-Collar of the Firestorm
Headdress of Alacrity
Evoker's Helmet of Second Sight
Tourmaline Crown

Chest:
Spellfire Robe
Mana-Etched Vestments
Incanter's Robe
Robe of the Great Dark Beyond
Robe of the Crimson Order
Vermillion Robes of the Dominant

Boots:
Boots of Blasphemy
Boots of Ethereal Manipulation
Frozen Shadoweave Boots
Silent Slippers of Meditation
Sigil-Laced Boots
Extravagant Boots of Malice

Hands:
Spellfire Gloves
Mana-Etched Gloves
Incanter's Gloves
Gloves of the Deadwatcher
Gloves of the High Magus
Energis Armwraps

Legs:
Spellstrike Pants
Battlecast Pants
Breeches of the Occultist
Kirin Tor Master's Trousers
Mana-Etched Pantaloons
Incanter's Trousers

Shoulders:
Frozen Shadoweave Shoulders
Mana-Etched Spaulders
Incanter's Pauldrons
Mindrage Pauldrons
Mantle of Three Terrors
Spaulders of the Torn-heart

Waist:
Spellfire Belt
Girdle of Ruination
Belt of Depravity
Sash of Arcane Visions
Mage-Fury Girdle
Sash of Serpentra

Wrists:
Bands of Rarefied Magic
Crimson Bracers of Gloom
Arcanium Signet Bands
Bands of Nethekurse
Shattrath Wraps
Bracers of Havok

Back:
Shawl of Shifting Probabilities
Baba's Cloak of Arcanistry
Sethekk Oracle Cloak
Cloak of the Black Void
Spell-slinger's Protector
Ogre Slayer's Cover

Rings:
Ring of Cryptic Dreams
Cobalt Band of Tyrigosa
Seer's Signet
Ashyen's Gift
Seal of the Exorcist
Band of the Guardian
Violet Signet
Sparking Arcanite Ring

Neck:
Manasurge Pendant
Talisman of the Breaker
Charlotte's Ivy
Warp Engineer's Prismatic Chain
Brooch of Heightened Potential
Hydra-fang Necklace

Trinkets:
Icon of the Silver Crescent
Shiffar's Nexus-Horn
Arcanist's Stone
Quagmirran's Eye
Oculus of the Hidden Eye

Vengeance of The Illidari is a very sweet trinket also.
Gives you + 120 spelldmg and + 200 healing ( dunno exact healing )
For 10 sec.

Can be obtained at a quest in Hellfire.
thought it was Overlord.

You seem to have put the wrong Violet Signet (tank) in this list, though