It seems you have two top mages and probably don't want more. You need a thief of some sort. This leaves you with Yoshimo.
Now you can't have three fighters because then you would have no healer. You definitely need a cleric to reverse some nasty effects of level drain and the like. So take Amoen since he is a decent fighter as well.
Take Valygar and possibly Korgan, or Valygar and Minsc for your front line depending on your preference.
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