Is "CC" Comcast?
We do have Comcast, I agree the guide is in need of some optimization, but their second set in the 1000's is a little easier, I just setup my favorites in that range. I do with they would add mirrors in the 1000's categories for the SD only channels to avoid having those few channels in the 200's, etc.
In our area most everything is HD except a few cable channels that I wasn't expecting (like TCM), and sub channels, religion, local access, etc. I'd say anything in the "top 100" cable networks is most likely in HD.
I assumed it was CableCard. Could be Cable Company I suppose...