White wax wood staves are quite nice. Stronger than rattan, inch for inch. Back when I was taking lessons, just about all of the more advanced students had broken rattan staves during practice at one point ot another. The instructor's waxwood staff had a smaller cross-section (which made it more comfortable for some people) but was very sturdy. They frequently come with a bit of a taper, which most people like for their walking sticks.

And, er, yes. Stay away from those nunchakus. They're more dangerous to you than to anyone else, unless you've taken a good bit of time to train with them. Put the same training time into using a stick, and you'll have a more useful skill. Whether you're in an urban setting or a wilderness one, the chances of being able to find something stick-like are pretty good. How often will you be carrying nunchakus? They're inconvenient and will always excite comment. If you're dead-set on that STYLE of weapon, learn to use a chain or a weighted rope instead. At least that you have some vague hope of tripping over as a found object (or quickly improvising from your own kit).