You're not alone. Of the estimated 3,500 species, I'm only well-versed in about 10 and have heard the names of maybe 20 others. This is a great site to learn more, though. Right now I only have German and have had hissers and Discoid.
At any rate, it's great to know of you and these others who share this awareness and affinity for our little friends. Most people I talk to don't give roaches a second thought.