In the one game that I actually completed, Imoen was a full million XPs behind the rest of the party. I had Imoen for the roleplaying, but Nalia was my main artillery mage. Just to put things in perspective: Imoen's mage level was even with Aerie's. If you rush off to Spellhold early in the game, you can safely dump Nalia. Otherwise, she is your best non-evil NPC mage.
-Cayle
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