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Danios are hardy tropicals that will tolerate just about any water chemistry; they also tend to survive the cycling period if the bacteria you've introduced don't do away with that entirely (I've never used the bacteria packets, so I can't speak to their effectiveness.) There are several types of danios (pearl, zebra, longfin) so your kids may like one of those. Stay away from giant danios, though; they need a larger aquarium.
If you want other types of tropicals, first find out what your local water chemistry is like, specifically hardness and pH. It's easier to choose fish that prefer your water chemistry than try to adjust the chemistry for your fish. If your water is hard and basic, livebearers (mollies, platys, swordtails) are a good choice for beginners. Soft, acidic water is good for tetras and rasboras. I'd stay away from neon, cardinal, and rummynose tetras at first, as they tend to be more delicate, but most of the others are ok for beginners. If your pH is more neutral, barbs may be a good choice.
If you get different species, make sure to pay attention to temperament. Buy a few fish books at your pet shop so you can learn about the different types of fish and their requirements and compatibilities. This is a good way for your girls to learn about fishkeeping (while keeping them interested with pretty pictures) and may get them interested in subjects like biology and chemistry.
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And you believe Bush and the liberals and divorced parents and gays and blacks and the Christian right and fossil fuels and Xbox are all to blame, meanwhile you yourselves create an ad where your kid hits you in the head with a baseball and you don't understand the message that the problem is you.
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