Level 1 - Enlarge person
Yeah, I know the tech is limited on this one. I'm not asking for huge characters, visually, but it's the single best buff spell for arcanes to cast on a tank type. Have the spell adjust the damage dice on the character's attacks and don't bother with the visual fluff, for all I care.
Level 2 -
Mirror Image
Staple self buff for arcanes. Blur is weaksauce. Not especially concerned about the visual effect here, either. displacement was fudged, why not this one?
Level 3 -
Blink
What rogue doesn't want a blink wand? Seriously?
Level 4 -
Evard's Black Tentacles
I know, we don't have grappling. We do have strength checks, pretty much the same thing. Can be adjusted to fit current mechanics.
Greater Invisibility
Because real wizards aren't visible.
Enlarge Person, Mass
Same as above for first level
Level 5
Baleful Polymorph
Because turning eeeeeeevil devils into broccoli (or fluffy bunnies, if you prefer) is fun.
Level 6
Repulsion
Because nobody CAN get close to a wizard.
Level 7
Spell turning
Because it doesn't seem THAT difficult.
Level 8
Mind Blank
Because it just plain rawks.
Maze
See Mind blank reasoning.
Level 9
Weird
Mass PK, should be easy....
Imprisonment
Because there needs to be more will save or dies.