I rececently received as gifts
a Jo and Bokken made of Shiro Kashi. I love them both very much. I'm cautious using them against Red Oak and such because I've seen my Sensei break less well made Bokken. You cannot go wrong wtih Shiro Kashi or Hickory weapons. This is for everyday use. Now if you must have custom-exotic then go ahead. By the way my weapons came from Tozando in Japan and both can be purchased rather inexpensively, less than $75 I believe. http://tozando.pair.com/eng/
Good Luck in your training!