What is a good/best baby grand piano with player capability?

You probably mean a modern electronic digital player. I don't know of any piano companies that sell them complete now, you can buy a good grand piano and have a Piano Disc system installed. Here is a link to a company in Massachusetts that will sell you a piano and install the system: http://craftsmenpiano.com/index.htm. There are probably other places too. Warning- this is EXPENSIVE!

Your question is not "crystal clear": do you mean a baby grand, that has a "self-playing" component? Like, punched holes in a rolling piece of paper, that activates a mechanism which then plays the piano?

If that's what you are referring to, I've never heard of such a beast: the only self-players I've ever seen or heard of, were up-rights.

If the above is not what you are referring to, then I have no idea what you're talking about.

Wotan