Neons will become angel lunch. Red Serpae tetras might work, and have great colour to them. A quintet of five clown loaches can be a lot of fun (mine fly all over the tank, not just the bottom). However, they do get big (can get to be 14"!) so you'd probably have to swap them out as they grow.
You could also put in some in some Red Velvet swordtails. They are brilliant red/orange in colour and are livebearers. Your angels will chow down on any fry you might get, but if you were careful, you could probably segregate the fry intil they were big enough.
I have a bunch of danios in my community tank (5 each red-finned and leopard) and they have been getting slightly nippy of late and may be removed.