It really depends on give build. Are you using the dot build or dark flare?

For the dot build I will refer you to a Nos' build since I would just be repeating what he says. Works for me. He updates his builds with each DLC when changes are waranted.

http://tamrielfoundry.com/topic/noss-guide-to-magicka-templar-trial4-man-dps-thiefs-guild/