Here's a list of all the Gromphaorhini:If we are talking species that can produce "hissing" sounds, there's also Elliptorhina laevigata, Elliptorhina Davidi, and Aeluropoda Insignis as well. If I'm not mistaken, according to bug guide, there are several more "hisser" species in different genus not in the hobby.
http://cockroach.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1174384