I suppose if you are happy with the first edition, there is really no need to get the second, since the added new material is very minor and there are hardly any noticeable differences in the "alternate" versions. I am not particularly sure about the sound quality differences, since I haven't really compared the two versions... perhaps someone else has?
While I didn't ask the question your feedback is appreciated. I own the previous release, love it, would like to pick this one up but not sure it merits double dipping either. I'm better off putting my money towards The Cowboys and Small Soldiers, two scores I don't own.