I'm starting again, to try some of the other NPC's, and need to know whether there is any risk that the good and evil ones start fighting or chasing each other away. Keldorn and Korgan are good, but will they last the game together, assuming I keep my rep in the early teens? (by acting neutral, say)

Only certain NPCs will act up if in the same party. These include Minsc/Edwin (no kidding), Keldorn/Viconia and Korgan/Aerie. I think that's it.

I dont know. Aerie and Jahiera seem to be pretty bitchy to each other in my party. Maybe becuase Im flirting mercilessly with both of them!

Ha! Thats the spirit.