I'm a dealership tech so I see all kinds of boxes and the big name boxes for the most part last pretty much forever. I've had the same 60" Cornwell box for over 25 years and it's probably the last box I will ever own. Quality ball bearing drawers are a must on the large drawers . You can find good deals on used toolboxes now in this crap economy . I looked at a Milwaukee tool box at a surplus store a few weeks ago and it was pretty good quality for a $1200 toolbox. I paid about $4500 for my box 25 years ago and I can still get a good trade in value.
Waterloo makes a lot of your better mid level boxes so research boxes made by Waterloo
Gus