Arghh... I had a lengthy, well thought out post, and then something happened and it's gone forever. Oh well.
Short story, I think every variation should be a separate listing. There's not all that many anyway. I think that throwing all the variations into one listing will do more harm than good because a lot of collectors have at least a few games that have different versions. Looking at the Atari 2600 games, most have at least 2 different labels. Some have 5 or 6. That can get confusing very fast. If the "non hardcore" people didn't know about a variation going in, they most likely won't care, or it might even open them up to a whole new aspect of collecting. Not to mention, this has already been covered in the style guide.