This might sounds weird, but I'll choose Anomen.
If he gets knighted, he's really better then. Anyway, another Cleric won't really hurt.
Give him the Crom Faeyr and he'll be good (Viconia rocks with this too)
The reason why I don't recommend Korgan is because you seem to have a goody party.
Jaheira may be "Neutral", but she seems to prefer good parties to evil ones. Also, Anomen is a pretty powerful cleric (Max level is like 15?). And he can fire up that Turn Undead for vampire busting.
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A Drawn Sword;
A Trickle Of Blood;
The Tempest Is Brewing.
Nemesis....
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