Back on topic, I replaced Jaheira woth Faldorn in BG1. Frankly, I never noticed a difference. But in SoA is just is no equal replacement for her in class or in character, simply because she is well developed and scripted. I have gone a party without her a few times simply because, but I have a mediocre respect for her.
Incertainty - Sorry to hear about the computer bum. My computer always gets a virus right about the time I'm about to finish a game and near the climactic end of the story, and it's starting to get old. Don't feel left out.