From a new hobbyist/bp owner point of view I would go with basic morphs that are eye catching that aren't seen in most other chain pet stores (ie hypos, spiders, albinos, lessers/butters, mojos, etc)
From a breeding/already established hobbyist point of view I would personally like to see combos and morphs that aren't seen all over the place (spotnoses, axanthics, calico/sugars, champagnes, etc)