I too would go with the Mag-Lite. All the other options are still "purposeful weapons" and could still get you in trouble with "premeditation" or "intent to harm" etc.
I would go with a 6-cell Mag-Lite, unfortunately the 6-cell "C" lite is discontinued. It's thinner profile made it easier to carry, and use as a club. However the 6-cell "D" Mag-Lite is still availible, and you can get a "Grip n' Clip" from Nite-Ize which makes a handy hand-strap for the light.
Then, you might want to consider some "upgrades", The first one would be a LED upgrade module. Mag has them now, but they're not the best. Look into Terralux, here is an example:
http://www.zbattery.com/db-3w.html
Note that the upgrade module is for a
3 battery Mag-Lite, and you have a 6 battery model. Make a spacer using PVC pipe or lightweight wooden dowel rod from the hardware store that's the length of three D cells, with contacts on the end and a wire running down it's length to carry the current. Install that first, then the remaining three D cells go in at the end twoards the tail cap.
You now have an impact weapon, with both reduced weight, and that weight concentrated at the tip, that's a functioning flashlight with an LED "bulb" that won't break under impact.