One of the problems with the Plano carrying cases is that they don't work well with Jada and other larger 1/64'ish diecast cars.
I have been buying those little plastic boxes from Protectopak for about a year now. I really like them. They stack ok up to a point, maybe 5-6. What is nice with them compared to the Plano case is that I put stickers on the bottoms of them with the car descriptors. The problem with the plastic boxes was that they kind of max'ed out at a JL Superbird size car.

I was thumbing through the website and either the item is new or I never saw it but they make longer plastic boxes. Now I finally have a storage option for my Jada and other larger diecast. So far the only thing I have that doesn't fit is the Jada Coe trucks, some of the other trucks due to heighth, and a few Limo's I have.

http://i127.photobucket.com/albums/p122/ir8vermin/deluxecase.jpg

http://www.protectopak.com/.sc/ms/dd/ee/6/BB45796%20Deluxe%20Protecto-Pak%AE

I resorted to buying those clear fishing tackel boxes. They fit rather nice and most cases are adjustable. I just pulled every other divider out and they fit perfect.