Hm rikard, this is 4 mages, and remember, this is not BG2, there arent lotsa scrolls of the same spells so maybe some of your mages would have only a few lousy spells

. I think that with 1 main mage and 1 backup mage (a multiclass gnome with cleric or thief) would be ok.
Elven fighter (specialized in long sword)
Elven fighter (specialized in bows and two handed sword)
Human ranger dualed to cleric
Elven thief
Gnome cleric/illusionist
Elven Conjurer
I think this one is pretty balanced (at least for what i like

)
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"Let my spells do the dirty work" Ertai, High Sorceror of the Holy Flame