@70 having 5x magma totems will help distract your targets as well as offer some nice AOE if you can afford the mana .
Fire nova totem's damage i think stacks some with your firedamage. if this is the case you can easily get 5x700-800 Fire aoe as long as the totems dont get smacked by mobs.
wrath of air stacking is nice +15% hit/crit but it uses up the fire totems slot.
