I really like Endli and Ornates. I'm just not sure of how well they will go with my choice of Psittacus and Crenicichla for your tank. Have fun choosing.
delhezi bichirs are cool and have fun patterns.
Have you thought of a nice alage eater??
I have a 4-5'' flagtail that keeps my tank 100% clean. You'll have plenty of room for a flagtail prochiodulis.
Plus a trio of redhook silverdollars myleus rubrippinis) or widebar sd (myleus schmoburgkii) would look cool.