Poison/fire will give you a lot of hp thanks to both passives. Flamestrike is great for killing bosses, but don't forget about flamefront, some bosses like Xazax spawn something/cast something per tick and Flamestrike ticks A LOT, while flamefront is just one, strong missle. But what is nice about going light/something is that when you main light tree, you can go for light tree set
Elemental Children
Elemental Children
(Sorceress Lightning Set)
Elemental Clash
Elemental Fury
Elemental Spirit
Elemental Storm
Set Bonus with 2 or more set items:
-20% to Enemy Lightning Resistance
+50 to all Attributes
Set Bonus with 3 or more set items:
75% Cast Speed
+25% to Lightning Spell Damage
Set Bonus with complete set:
+5 to Sorceress Skill Levels
+150 Spell Focus
Blink Cooldown Reduced by 2 seconds
+50% to Lightning Spell Damage
+16 to Blink
+100 to all Attributes
Physical Resist 15%
which gives you blink. You have strongest tp skill basically for free