I apologize Brushan. There was almost good information here.. and there is, but we've strayed away from the question. To get back to it: Many mage specs can work while leveling, and a lot of things come down to player preference (like Imp CS).
Here is a fun AoE deep frost leveling build. http://calculators.iradei.eu/talents/mage?2300050010000000000000000000000000000000000000235323313235013221501
It relies on heavy blizzards, novas, and Frostbite procs to utilize the Shatter + Ice Shards talent combo we've all come to know and love.
You can shift some talents around if you prefer a heavier hitting Frostbolt. I would personally take from: Imp. CoC, Imp. Blizzard, Winter's Chill, Ice Floes, or Permafrost.
BONUS: Amazing for PvP