I have found that with the new gear I want the main casting damage form to have the biggest insightful spell power bonus that I can find. So my wiz has as his base equipment a insightfull force weapon +38 at lvl 14 a necklace for 80 force power and +3 evocation dc. He wears a +11 spell craft item. Dont neglect your spell craft. It seems like checking the auction house for spell power items and often using two weapons is the best way to stack spell power.
When switching to electric he uses a +99 magnetism weapon and a +30 insightful magnetism weapon dual wielding. It seems like there should be a better spell power combo than you get from the war wizard staff.