Re: Ordering a bokken/jo
I have and recommend (if it matches your style) the Iwama-style bokken from Kingfisher. I ordered it slightly thicker than standard to handle the heavy contact.
I'm the same height as you, and went with the standard length. I've heard that a good way to measure swords/bokkens is to hold it naturally down at your side, and the tip should just barely miss the ground.