I bought some Neons to put with my Angels a while back and they chased them around for about a day then left them alone. But the Neons ended up dying one by one after that, not by getting eaten though, maybe they're just sensitive fish or maybe it was the store I got them from.
So then I went with some Rummy Nose Tetras. Much prettier fish in my opinion. It was the same thing at first, the Angels tried to get at them for about a day or so then stopped. Now they completely ignore them and everything is still fine. My Angels were about a year and a half then so they had a little size on them. If you get the Angels when they're small then you really won't have a problem, not for a long while at least.