ok as promised, here's the build of my priest:
i didn't bother putting any points into Source of Magic as the mana increase didn't seem to be worth it (i've had it before, left it out after reskilling though)
Divine Light... has a cast time of 4sec 'nugh said
never seem to have a spare point for Calmness even though it's a pretty helpfull talent :\
well guess it's visible i don't care that much about manacosts XD
not too far away from your level but at least you have something to compare with... i'm pretty happy with how my build is... exept that huge mana drain of course