I love the discus idea too. Neon's might be food for the discus or angel fish though. The larger variety of tetra's would probably work but as always it will be good to provide hiding spots, rocks, wood, plants, etc. I do see angles and neons together often online and in stores so it must be just providing them hiding spots and keeping the larger fish well fed. I've been recently thinking of congo tetras. Not sure if as a center piece fish or something on the side. I don't know if they would get a long with the angels but that would be nice to provide color with angel fish. My LFS has a great stock of them with some fantastic color. Some of the congos I see online don't look nearly as colorful.
Anyway, good luck. I'd just say go to your LFS and see what they have. I always amaze my self when I find a new LFS and some of their showroom tanks that are amazing.