Walk around the store and gather a bunch of tools up, then fill a few drawers in the toolbox to see how they open. I know that I would never own a never craftsman box, they are just too flimsy. The harbor freight boxes seem much more rugged.
One thing to consider is how secure is the box. Last october when I was out of work, the garage I had my toolbox in got broken into. They apparently worked at it for a while, between trying to drill the lock, then resorting to just beating on it to try and open it. They eventually got into the top drawer with a 5 foot prybar, and even then, the drawer didn't open, they bent the center of the top drawer out enough to get an arm in to take what they could reach. The steel never broke, the only reason they got that far is because its a 65 inch drawer. they tried prying on the rest of the drawers, and never got anywhere. If I had a craftsman box, I would have been replacing all my tools, not just the contents of one drawer, so for me the 10k investment in a toolbox saved me roughly 50k in tools that were not stolen.
If you want my advice, buy the most rugged toolbox you can afford. search craigslist, you can usually find a used snap-on or mac box, or even a older(mid 90s at the latest) craftsman box.