30 gallon long I am assuming?
I like the neon tetras, but I would suggest keeping a somewhat darker decor and/or plants in the tank. They actually like to have some areas in which to stay out of really bright lights and I think that even if you had some dense fake plants, it would help them to be more active and confident.
Small schooling fish are sort of hard to come by in many ways. First, there is a difference between schooling and schoaling fish that should be taken into consideration as well. Schooling fish are what most people think of first and are fish that stay together all of the time and travel all in the same direction, in general. Schoaling fish stick together, but more losely and will act more independantly of each other and swim in all different directions. Most tetras are considered schooling fish, but I would say that they act closer to the definition of schoaling than anything else. For example, I have a tank with 8 tiger barbs, which the LFS labels as 'good schooling fish', but they swim in all different directions and do not stay in a tight group really.
The angels are typically good in a tank with smaller fish like guppies, and could add a good contrast to your tank or act like a 'centerpeice' fish so to speak. However, many people find that as the angels age to adulthood, they get more aggressive and can/will eat smaller fish. It is ALWAYS best to keep in mind adult sizes of fish, especially their mouth size when looking at a community tank with small schooling fish. Even fish who are not typically known as carnivores or fish eaters will take any meal that presents itself since another fish is a good source of protein and nutrition that does not come along often. Angels are cichlids, something that many people do not see them as or consider them to be when stocking a tank.
Dannios are also a good, small schooling fish and could bring interest to a tank with another school of neons. They can nip a bit more than most people like, but I feel that if the schools are equally matched or if there are a couple more neons than dannios, that would be a very minimal problem.
I also really like the glo-fish which are basically zebra danios that have been fed marine corals or algeas that glow in the dark so the glo-fish, literally glow in the dark. They are a lighter red to bright pink color so they can stand out against almost anything in a tank.