Enchants

• Head: Arcanum of Burning Mysteries
• Shoulder: Greater Inscription of the Storm (or Master's Inscription of the Storm if having Inscription)
• Cloak: Greater Speed (or Lightweave Embroidery if having Tailoring)
• Chest: Power Stats
• Wrists: Superior Spellpower (or Fur Lining - Spell Power if having Leatherworking)
• Hands: Exceptional Spellpower (or Hyperspeed Accelerators if having Engineering)
• Waists: Eternal Belt Buckle
• Legs: Brilliant Spellthread/Sanctified Spellthread (Tailor)
• Feet: Icewalker in BiS Gear (you can just use Greater Spirit if you have hit without Icewalker)
• Rings: Greater Spellpower if you are Enchanter
• Weapon: Mighty Spellpower on one hands, Greater Spellpower (Staff) on staves

Gemming

Red: Runed Scarlet Ruby and one Runed Stormjewel (fishing daily) (or in horde max personal DPS BiS a Rigid Stormjewel (yellow) in chest)

Yellow: Veiled Monarch Topaz/Rigid Autumn's Glow
Blue: Purified Twilight Opal
Meta: Chaotic Skyflare Diamond

You would want to use 2 Purified Twilight Opals (cloak and necklace in BiS) to activate your meta-gem, otherwise use only Runed Scarlet Rubies, and use Veiled Monarch Topaz or Rigid Autumn's Glow if you need more hit rating. Use yellow gems to activate bonuses such as T7 helmet which gives you +8 haste bonus or chest that gives you +6 spirit as bonus if activated. In alliance BiS gear you would want to use only one Veiled Monarch Topaz in your helmet, in horde BiS gear you want to use Rigid Autumn's Glow x2 in your waist and chest and a Veiled Monarch Topaz again in your helmet!