Depends on what he teaches...if he's a biology professor--the life in a DSB will keep him interested. If he's a microbiologist--the anaerobes in a plenum would be worthy of a paper. If he's a physics professor--I'd love to see his equation on random water movement in a barebottom. And if he's a chemistry professor--it doesn't matter because he'll only be interested in the supplements anyways!
Seriously though, it depends on what you want to keep, maintence you're willing to do, size of the skimmer, funding, blah, blah, blah. We all should know by now that there is more than one way to get the same results.
A DSB with a plenum won't work though because you need to use a coarser substrate than sand (2-4mm) and I personally feel a skimmer is a must no matter what else is in the setup.