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How accessible do you want these buckles to be? Do you wear them?
I like the idea of the plexiglass case; another thing that comes to mind would be a coffee table with a glass lid that would display some/all of them. I'm not sure how large it would have to be to hold all of them, but in combination with a wall unit, it could work...
I'm thinkin something like a vertical rod with a stack of independently rotating elements the rough dimentions of a bicycle rim. Maybe wrought iron hoops or some kinda 'frozen rope' with one two spokes. Use a leather belt variation that will accomodate many buckles all the way around each hoop. Add hoops as needed. Motorize for extra credit.