Wizard Focused Specialist Evocation.
Drop: Illusion, Enchantment, Necromancy

Conjuration still has amazing control spells and most importantly teleportation and summoning.
Transmutation has some great buffs for low levels (you didn't say what level this is for) and most importantly timestop.

Arcane Thesis on fireball or delayed blast fireball is a great way to go. Make sure to put on some fell animate on there so you can bring some minions along too. There are some good touch spells searing ray comes to mind, make sure you play towards the enemies weaknesses (so have choice spells for each save/touch ac) and not just to how much damage you can do if they make there save.

And keep a few walls/buffs available. Best thing evocation has is the walls.