I'm looking at this to be a staple Arcane/Fire build
http://www.worldofwarcraft.com/info/...00000000000000
The only points I would change around depending on encounters are either 3 points out of Arcane Mind and into Magic Absorbtion, or 3 pts out of arcane focus if my hit was capped.
I am also rather reluctant to put points into IMP arcane missles. I'm not sure they warrant 5 talent points except on those odd AOE damage encounters. If so I would probally put point in fire up to something like this...
http://www.worldofwarcraft.com/info/...00000000000000
With the imp fireblast as a filler point.