I don't know about "rare" colored angelfish. Pinoy's seem to be the new rage, I'm seeing alot of people posting pics of them on the angelfish forum. Altums are always highly sought after as well. I saw a completely red angelfish on a website for sale...never saw that before. If you try www.angelfish.net, there's a good group of experienced angelfish folks there. Many of them are breeders, so you may get a more specific answer.