i am currently leveling a Sorcerer and im a mobility freak so to say.
i find that while leveling a mix of madness and lightning is pretty decent.
went madness to unlock the insta crushing darkness and then all the way in lightning wich gives plenty of insta proccs.
example :
opening fight fight force lighning untill three stacks wrath, then crushing darkness, again lightning then at 3 wrath lightning strike insta, that one proccs the insta chainlightning rinse repeat.
cant tell how it will be in endgame but it sure levels nicely.