If you intend to store all of them in a case, much larger than that. That initial one I linked is not an efficient use of space, but it was a cheap option to show you what I was talking about. You'd probably want something from Feldherr, or just a large tote you can fill with their pluck foam levels if you want to have your entire collection in one case.

Personally I have a display shelf for the collection (nearing 250 after I get all my Kickstarter packs on it) and a briefcase size case to take 12 or so to the game.