Not only is the citrina hard to find, it's notoriously infamous for being challenging... as is ionopsis (usually dies pretty quickly), and quite frankly tolumnia... heard much griping about those over the years although they seem to be readily available... mine do ok I guess. just got another one from a friend who said "they do ok for you? all they do is die with me..."
I should also add rupiculous laelias are also known to be challenging, and from my own experience very slow growing and hard to get going in a new environment... some species easier than others...
The brassavola would be a great choice, readily available and very rewarding! but I and many probably have one already?
Just thinking aloud, something that grows well, adaptable, relatively easy to flower would be good for a group thing in my view...
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