If I may, based on what's been said so far..
The scape plan sounds really nice, simple yet sweet.
As for the fishies if I were in your shoes I'd go with almost entirely black angelfish, and two or three white or marbled ones just to break up the black a bit, or reverse it and go mostly white with a few black, both would look cool.
I'd choose plecos with bright oranges and/or reds on them, not sure which ones I'd go with but that would be my starting point when looking for ideas.
Then the fire eel and bgk would top it all off.
That's my thoughts on the situation.