I got a full set of Snap-On nut drivers from a pawn shop, no trays. That's OK, I'd been considering a rack anyway. Based on some GJ recommendations, I ordered the Sunex 8011BL from Tooltopia for $34, who shipped it right out and it arrived a few days later. A few scuffs in the powder coat appear to be from the factory.
Pros:
Heavy gauge steel construction
Available in several colors (unlike the smaller 8008)
Large capacity (26 pieces)
Cons:
China
Top mounting lip not curved, requiring mounting screws
Outside holes larger, would prefer to ream them out selectively
My Mac top box has 12" on center holes on both sides, the Sunex has 15" OC holes, so I drilled the Sunex to match. The top lip is a simple right-angle, not the usual J-bend that shelves and socket racks use, so bolts are required unless you have a sheet metal brake. I also pulled the hinge pin and removed the outside half of the box-I don't need the security in my garage, but I do need the room!
I lived with it all weekend, so far I really like it. In fact, I'm thinking of removing the side handle on my bottom box and putting another one there. The quality is better than any Craftsman non-professional box accessories, but not "built better than it has to be" like the tool truck brands. The color matches almost spot-on, you have to be looking for the mismatch. If you've been on the fence about one of these boxes, consider this a vote for picking one up.
