First, the cable box model. As a general rule of thumb, if you can't find your cable box's model in the list of devices, simply try the closest one to yours. I would try MX011ANM for your particular box. If that doesn't work, try Comcast X1.
Also, if your cable box model has only HDMI for video, it might not work for streaming a Slingbox. Take a look at this article:
The best way around this would be to use some kind of HDMI to component converter. Here is some information on an example of one such device:
All the best!
Sling Media Tech Support Team