I have a US General Series 2 72" box, and it's been great for me. I was in the same predicament when I outgrew my small Craftsman box, and was looking for something bigger. IMO, the tool truck boxes are very nice, but way overpriced.
My only gripe about my box is that it didn't come with soft...
We use the Starrett S011 Hidden Edge box cutters at work. They're a little bulkier than the ones in this thread, but the blade stays hidden when not in use.
https://www.starrett.com/details?cat-no=S011