I took averone's riser lead and picked up two items today to sort of help my display out a bit. I had rearranged my glass case and placed all of my busts together a while back, but they were sort of cluttered on the bookshelf top. With the tier system in place, they are more presentable, although it's no joke I need another case.
Here are some of the Iron Man busts I've got after rearranging a bit tonight. This set up was a problem before I was able to arrange them as you see here:

I also bought some risers to help out the 6" shelf in my armory case. It helped the display quite a bit.

