I used to have a large shoal of leapord danios in my old tank. They are really cheap (around 90p each) compared to other `shoal` fish and look really nice. They arent the brightest but their spots give them a very `wild` look.

When fully grown they look really nice.

Tropical is the way forward, there is just that little bit more variety with them, but as you say you dont want her to get bored he he :-)