Im a huge X-MAN fan, unfortunately I don't think Im gonna part with it -- still holding out hope for a full Jim Lee run with outliers like Cable, Nightcrawler, and Kitty.
I am using IKEAS PAX (biggest size) with frame, lighting units and acrylic panels still not installed. Like I said holding out hope for X-MEN run with a shelf for Magneto, Sinister and Juggernaut.
The reason why the coolest ones are on the ground is due to weight. I wish my DC Shelf could be center stage but Batman, Superman and Wonder Woman would exceed the max weight for the higher shelfs. Ironically the biggest pieces I have (Apocalypse Rulk Rhino) are light enough to hold more of the larger pieces that don't fit in a BESTA.
I can pretty much expect Juggernaut to be like Rulk.
The max weight for the upper shelfs (recommended - im sure it could exceed it) is 45 lbs.
I could fit both my Hulk PFs (RED and GREEN) one one shelf, whereas when I could HAD both Comiquettes (green and red) i'd have to display them on the ground (exceed weight, I think both are almost 30 lbs each).