well it's worth on trying an evil wizard. I've made up one and i've maxed out:
INFLAME(your primary spell)
FIREBALL(your primary spell)
INFERNALL RATH(pretty cool but save it for later )
LIGHTENING(your secondary spell)
SLOW TIME(your secondary spell)
MP
HP
TOUGHTNESS
Dont forget to spent point to HP, MP and DEFENSE too!!!
All you need is those spells and you have the most powerfull wiz kid around.
For a good wiz take out the INFERNALL RATH and put the oposite(dont remeber the name,lol)
PS: if you max out all the above skills try out the mana shield(if i remember the name right or you can change it with slow time, well it's your decision).
