I have kept Silver Bantams for several years now and they are my favorite ducks of all the breeds I have kept over the years. In my experience, in addition to being beautiful, they are quiet, calm, and friendly. Even the birds I have bought as adults are extremely calm and outgoing. I am not sure that anyone in the US has true Miniature Appleyards. If they do, I have never seen them. What everyone has that I have ever seen is Silver Bantams. I am working to develop a true Miniature Appleyard like they have in Europe, which I may sell for the first time later in the year. As other people have already said, there are Silver Appleyard Calls too. I don't know anything about the development of the color in Calls or whether or not they are true Appleyard color, but they do look like they are from what I have seen.
I also have kept the Australian Spotteds for several years as well. I really enjoy having them too. I don't find them to be *quite* as outgoing as my Silver Bantams, but they are still very calm and friendly. As far as beauty, it doesn't get more beautiful in my opinion. I have and absolutely love all three colors, especially the Blue Heads. I, personally, do not care for Black East Indies. I may very well add them again this year because I think they are so pretty. Personality wise though, I did not find them to be very friendly when I had them before and I got mine as ducklings even. It might have just been my individual birds though. Anyway, Holderrread's have them on sale and I know Ideal sells them as ducklings for only about $5 a piece.