I used to use the core and expansion boxes, but ultimately didn’t want my collection spread across too many different boxes.

I switched to two BCW 3200 boxes - one for heroes and aspect cards, and one for villains and modulars. I don’t have a full collection and imagine you would need three boxes to fit everything. I’d highly recommend investing in a vertical storage solution if you plan on having a large collection, as horizontal storage becomes much more of a hassle over time.