My needs require tough cases. I was using road cases but they are heavy and expensive.
I wound up buying these Rigid brand tool boxes at home depot. This is a link at amazon http://amzn.com/B00P4RSJKM
They are much cheaper at home depot.
I have a Mettle 600 AD, battery pack, spare battery, spare bulb and cords. I used Kaisan foam to hold those items in place. Velcro straps are attached on the inside lid to hold a 33" folding softbox. A bogen compact light stand will also just fit in the box. The inside is just a hair over 20".
Take a look at the full set they have. I have one full set that the bottom box (with wheels and handle) contains extension cords, gaff tape etc. One box with the light kit and the small box is setup as a camera case. The cases lock together and the base comes with a steel rod that runs through the set for better security.
Portable and strong and easy to move.
I would post pics but the gear is all out for events.