is there more than one transfer cable for the different versions of the xbox. I am about to replace my original 360 with a slim and I have noticed that there are some cables listed as "for the 360 slim" and some just say for xbox 360.
I believe the Transfer Cables are universal. In any case, I just went from an old 20GB to the new Slim and used the Transfer Cable that I've always seen. Just plug the HDD into one side and the USB into your new Slim.