My understanding is that the albinos are usually an albino form of the bronze or pepper cory, so a school of some albinos as well as some normal colored bronzes or peppers (depending on which particular species the albino ones you get end up being), would allow you to have the diversity while the cories themselves would probably see themselves as all being the same kind and be happier together than if they were a mix of other species.
I've read elsewhere that, while cories USUALLY school together, they may not if they are drastically different in coloration or size.
In my own experience, I have three panda cories who are full grown and a juvenile panda who seem to segregate by size.
I've noticed that the three adults spend most of their time together while the juvenile often is all by himself (although occasionally they do all group together, and I expect the juvenile will go with the adults once he has grown bigger).
The advice about pandas being fragile seems warranted. I love my panda cories but if I had known ahead of time how many people have trouble keeping them I may not have gotten them. So far mine are very active and healthy, but I've only had them for 9 days. From what others say, it seems like they get sick and die with very little warning and need very clean water.
On another forum someone suggested you should use MelaFix on them at the first sign of illness, because once they're sick they go downhill fast.