The Citadel Crusader case would work, and as a bonus, it's quite flexible.
As an alternative, replace a couple of the trays of the zigzag foam in the Crusader case (which is ideal for the chaos knight, rhinos, hellbrute and other oddly shaped/large models) with standard pluck or precut trays. Many hobby shops will carry foam that can be cut to fit, that store standard, infantry-sized 25mm models. Sort of, a hybrid solution
The downside is that the Crusader case is pretty expensive (then again, a lot of them are not cheap).