I know! I'm new! I really hate it when I do this but I do think it's a good idea.
So, here's the thing. If I want to add (let's say) Resident Evil 4 to my collection, the first thing would be to search the game. Right now, searching for Resident Evil 4 gives me 7 options. While not confusing since I know which edition I'm going to add, the results can become quite cluttered.
So, how about creating one page for each game and in that page we select which edition we want to add/edit. We could use a criteria (like date, popularity, etc..) to pin one of the editions as the default one (mainly for the purpose of showing basic info).
If you still have doubts, check this out:
http://amzn.com/B002I0JA7E (Deus Ex: HR)
We have, 3 consoles (PS3, 360, PC) and under each one two editions: Normal and CE. That's 6 entries on one page. At the end of the day we would have the same functionality, but with an easier way to search for an item.
What do you guys think?