If you can get in contact with him, Walther Von Krenner Sensei is an amazing calligrapher. When he paints a circle, it is, for all intent and purpose, perfect. So perfect that (i've heard) at one point he was accused of using machines to do the circles for him. Some of his work can be purchased on bugei trading companie's website.
http://www.bugei.com/subcategory_61.htm but if you could i would try to contact him personaly and make a personalized order. (if he does that kind of thing)