Here is a sites with lists of shrimp,
http://www.petshrimp.com/shrimpspecies.html
This is one of my favorite invertebrate reference databases;
http://www.wirbellose.de/start.html
Don't be daunted by the German language. It's easy to get to the information you'll want. The point is to use the invertabrate database of scientific names! Here is how to get to the database, and a quick translation of what each section is.
Click on
Artendatenbank in the middle of the green bar, just bellow the picture of crayfish and shrimp.
First is
Süßwassergarnelen which is
dwarf shrimp.
The 'dwarf shrimp' classification that they use is a little different than others. They include filter feeders, as well as the species more commonly referred to as 'dwarf' species.
Second,
Krabben, Crabs
Third
Krebse which is crayfish/crawdad.
Fourth
Mittelkrebse which means middle-crab. They are the evolutionary middle ground between crabs and crayfish.
Fifth,
Muscheln, clams.
Sixth,
Großarmgarnelen which are long-arm (Mostly Macrobrachium) shrimp.
Seventh,
Schnecken, Snails
Last is
Sonstiges, Other
Triops, Artemia, etc are all lumped in here.
Many of the links have pictures of the invertebrates, many include propper water conditions, and some breeding information. I would recommend, for now, just looking at pictures and scientific names. When you find some you like, search the web for English common names, or try asking here.
I find that the I most enjoy the hunt for new, unique creatures, so patience is key, and asking around for availability.