Hypersmurf
Moderatarrrrh...
Caliban said:5th is the minimum level the wizard has to be, not necessarily what his caster level has to be. And he's still higher than 5th level, no matter how many negative levels he currently has.
5th is the minimum caster level.
"The caster level you choose must be high enough for you to cast the spell in question".
Not "The caster level you choose must equal or exceed the class level at which you could cast the spell in question".
-Hyp.