I have two striped loaches (Botia striata) that are very fun to watch, these are the first loaches I've had but lots of people like loaches because of their personalities.
The other fish that I ahve that are pretty cool are rainbows. I have turquoise rainbows now (Melanotaenia lacustris), they are quite active (not quite as hyper as your danios) and seem to be very smart fish. They don't bother any of the other fish and are beautiful. They are hard to find, but your LFS
might be able to order you some.
That's my 2 cents....I bet you'll get lots of opinions! Good luck!