one species? you should get a couple different ones. My favorite is the endlicheri, they look awesome and they get big. I think endli's are the nicest looking species and probably the most active. Whatever you do, don't get a senegal! They're real small and mine hides all day.
I have an ornate and senegal now, I'm getting some endli's and some congicus.
Uh oh, looks like i am gonna listen to most of your opinions as far as not grtting just on species. Do they do well together in the same tank?. (different species that is). some lower and uppers look like they are becoming a must!!