Many thanks for suggestions, guys -
Zebra Dart Goby - I like the look of these, could you maybe post video?
Spotted Cardinalfish - I love their look, almost as much as the Bangaii, but they always seem a bit...static. Am I wrong? I have an image of my school flashing around the tank together, splitting up and then coming together (Which may be completely unrealistic of course)! Also I will be going heavily into shrimps etc so that's a bit of a worry with them.
Orange Cardinalfish - Not sure. They don't immediately appeal, but thanks for the suggestion.