Robert Yellin is the person to talk to about Japanese Pottery
I have never met anyone who knows more about Japanese pottery than Robert Yellin. I visited his Kyoto gallery a few years ago as was deeply impressed with his selection of pottery and his love of Japan. He is also a super nice guy and very easy to talk to. You can learn more about Robert at
http://www.japanesepottery.com. I highly recommend that you visit him when you are in Kyoto.