This a bit of an old list but roughtly what i have got
Orange Head - Eublaberus Prosticus
Pacific Beetle Mimic - Diploptera Punctata
Cuban Burrowing Cockroach - Byrsotria Fumigata
Madagascan Hissing Cockroach - Gromphadorhina Portentosa
Harlequin Cockroach - Neostylopyga Rhombifolia
Peppered Cockroach - Archimandrita Tesselata
Green Banana Roach - Panchlora Nivea
Rhinoceros Cockroach - Macropanesthis Rhinoceros
Madiera Roach - Rhyparobia Maderae (formerly Leucophaea Maderae)
Giant Cave Roach - Blaberus Giganteus
Death's Head Cockroach - Blaberus Craniifer
Death's Head Cockroach - Blaberus Craniifer (Black Winged)
Discoid Roach - Blaberus Discoidales
Guyana Spotted Roach - Blaptica Dubia
Lobster Roach - Nauphoeta Cinerea
Surinam Cockroach - Pycnoscelus Surinamensis
Lucihormetica Subcinta??
Dwarf Cave Roach - Blaberus Fusca
Firefly Mimic - Schultesia Lampyridiformis
Six Spotted Cockroach - Eublaberus Distanti
Femapterus Cockroach - Pycnoscelus Femapterus
Stripped Madagascan Hissing Cockroach - Princisis Vanwaerebeti
Dwarf Madagascan Hissing cockroach - Gromphadorhina Obglonganta
Shelfordella Tartara
This is a great link
http://www.angelfire.com/oh2/Roaches/Two species that I think are excellent and are used in the States
Orange Head - Eublaberus Prosticus
Cuban Burrowing Cockroach - Byrsotria Fumigata
The eublaberus when mature are a bit larger than Lobster roaches (Which are the ones I guess you have). They are pretty handsome as well. The Cuban are really meaty and also look really interesting.
Shelfordella Tartara are brilliant about cricket size and breed easily and dont climb. But they seem to have taken up residence in my airing cupboard

think they are on the retreat now though.
The Discoid Roach and Death's Head Cockroach are also used a lot in the US.
Some of the others on the list can be used but as the Rhinoceros Cockroach cost me £140 for 4 they would be a bit expensive!! The peppered are great as well but take 9 months to mature .. so not really viable
Regards
Mark