I'd prefer to see the professionals judge the contest, and agree with Rochr that their critique would be about the same as having anyone else do it, prestigeous or not. Depending on the amount of entries though, how about the finalists or however it'd work with the judging panel assembling an art book of the best work, and publishing the work of the winner somewhere or a gallery to hold a show of the artist's best work? Maybe getting Computer Arts magazine involved or some other gallery or publishing firm. Just an idea.