Can anyone please explain the differences between the box-sets released by "Creative Design Arts" and the 2-disc Special Editions released by Warners and why/how this studio is distributing these? What is CDA to begin with, is it just a division of Warner Bros. that specializes in production and art design or something?? I'm talking about the distinctions between the following for example: Warner Bros. Creative Design Arts + Warner Bros. Creative Design Arts And so on, and so on, including "Casablanca", "Dr. Zhivago", "Ben-Hur", "Bullit", "Bladerunner", etc... I'm aware that many of the discs featured in these sets have since been upgraded by Warner Bros. or if not, are in the process of recieving upgraded transfers/releases... but there are some such as Citizen Kane which seem to have been released only months apart, and these are the ones that I'm interested in. From the pictures depicted above and in Amazon's listings, an extra bonus disc seems to be included along with lithos and poster art, etc. In the case of Citizen Kane, the 'Gold Box Edition' seems to feature the RKO 201 disc as an extra. What else is different about these releases in terms of bonus material and which of the Creative Design Arts sets feature extra discs apart from Kane? Does anyone own any of these and if so, what do you think of them... are they worth purchasing over the regular 2-disc editions (at least for the few titles that are not being upgraded, i.e. Citizen Kane, Dr Zhivago, Singin In The Rain, etc)? Thanks!!