What I think would be incredibly interesting and fun is to do a shallow touch tank, something like a 48" x 48" x 12" (~120G). It would be big enough for several people to stand around at once, you can pick livestock that could be handled (ie. softies, some LPS, sea cuc's, etc) so the students can get more hands on (touching your first coral is really bizarre and cool) and you can get away with less expensive, lower power lights.
Understandably the logistic would be more difficult and you'd have to custom build a tank but I think the education and fun factors would be higher.
I've actually be debating building one of these for myself for a long time!
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