It is a roleplaying game you know, if you feel guilty about Jaheira and you are more than neutral aligned you should take her, on the other hand if you are a little less then neutral you should drop her and get Viconia, after all you don't really care do you ?
If you can not seem to fit in either if these two categories then you must be of the wrong alignment all together.
What I am trying to say here is you are the person you do the thinking you do the emotions and as such play the game the way that it suits you.
Now this is not to say, that you have played BG 125 times already and you wanna do something different, like playing a neutral character, and trust me it is neigh on impossible to be neutral ... in everything you do or feel, but you can try <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />