Personally I would get Anomen and Nalia and drop Aerie and Minsc.
Some people will hate me for saying this but both of them really get on your nerves in the end.
Anomen can become very powerfull and Nalia can level up enough to get some good spells.
Edwin was excellent as a Mage but just walked out on me when my reputation got too high.
Hope this helps,
Just remember do what you want, try them all, dump them if you dont like them.
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