What should I be aiming for with Hydrosophist?
It's got healing spells, and Rain, which is surprisingly useful, if you combine it with either freezing or lightning spells/arrows, or just to put out the fires you cast (or in other situations).
In Pyrokinetics you have fireball (classic), and a spell that creates fire in a straight line (firefly maybe ? don't remember the name) beside the elemental summoning.