I'll probably get flamed for this, but I bought a box from Harbor Fake tools (price was too low to mention). It has been a good box for about 5 years now. I load the drawers pretty heavy and it seems to do just fine. I don't used it commercially, just for my hobby stuff. I'd recommend it. Here's a pic next to my 20 year old Craftsman (horrible drawer slides, light stuff only)..
