Harbor Freight has a couple of really great boxes, the 44'' and the 52''. Pretty much top quality, and you want to get the coupon out of the sales brochure. Nothing can touch them for the price.
I have 2 44s that I turned into a workbench. You can literally stand in the drawers, they are that strong.
http://www.garagejournal.com/forum/showthread.php?t=53369&highlight=harbor+freight+tool+box