I'm in the market for a new toolbox as well, and after looking around I specifically asked for the 13 drawer US General 44 3/4" bottom cabinet. It's currently priced at $389, which is a steal for it's size. The drawers slide smooth on ball bearing tracks and seemed real sturdy when I leaned on them. The HF website says that each drawer will hold up to 120 lbs, and the box can take take 2900 lbs of weight, not to mention the box alone weighs like 600 lbs. Definitely beefy! I've been checking out the Craftsman boxes, but the quality has really gone downhill and for a Craftsman box of the same quality, the price is 3x as much as the HF box. The Kobalt boxes are nice, too, but they're more homeowner grade with lame gadgets like the car stereo and refrigerator built in, taking away from space for tools!. Not to mention the Kobalt stuff is crazy expensive even with the discount I get from my girlfriend's dad.
The HF box offers great expandability with the big top box, and allows you to add on 2 side boxes as well. If you added it all on, you could have a massive, quality set up for around $1000, which still couldn't buy you a used Snap-On bottom cabinet on Craigslist.
The cheapo black HF box is really lousy, but if you get the better boxes from HF, it's still an unbeatable value