Here are my premises for this overhaul:
1. CM builds cannot be touched (buffed or nerfed)
2. CM builds are the ceiling for potential buffs. As long as a build cannot be made that is better than SNS, it is in reasonable territory.
So without further ado:
Ray of Frost:
->Sleet Storm - Increase radius by 25%
Arcane Orb: Increase to 250% weapon damage as Arcane. AP cost reduced to 30.
->Obliteration - Increase to 325% weapon damage as Arcane
->Arcane Orbit - No cast time. 7 yard radius hitbox. Summons 4 orbs that circle around you for 8 seconds. When triggered, they explode but do not disappear, and deal 120% weapon damage as Arcane to enemies within 10 yards, with a 40% chance of knock back. When an orb explodes, there is a 1 second delay before another orb can explode. [Original idea by Dragonfly]
->Tap the Source - AP cost reduced to 18
->Arcane Mines - Reduce time to arm to 1 second. Damage increased to 320%.
->Power Stone - Increase Power Stone chance to 15%
->Convergence - Also changes damage to Fire [Original idea by minkywhale]
->Enduring Skin - Reduce Cooldown to 6 seconds. This rune is not affected by Critical Mass and Evocation.
->Scrap "Reversal". Put the Overdrive rune in its place.
->Overdrive - Remove the cooldown on Teleport. Increase AP cost to 25
Wave of Force: Cooldown reduced to 12 seconds
->Force Affinity - Cooldown reduced to 6 seconds
->Raging Storm - 720% weapon damage as Arcane over 9 seconds when two twisters collide
->Storm Chaser - 150% weapon damage as Arcane per Wind Charge
Mirror Image: Increased to 50% of your life per duplicate
->Simulacrum - Increase Life to 150% of your life
->Extension of Will - 25% of the damage you take is dealt to one of your duplicates instead
->Mirror Mimics - Spells cast by your Mirror Images do 35% of the damage of your own spells
->Pure Power (change to Vampiric) - Gain 3% Life Steal