Don't you know you're supposed to ask first? In all honesty, the odds are good that it may not matter until you start getting into pushing something like Deep Color through ancient-spec HDMI cables (it may or may not work), or some future HDMI technology that requires even more bandwidth may not be able to be pushed through original-spec HDMI cables. The only reason I mention it is that on monoprice, it's so dang cheap to get the Cat 2 cable.
Yes, they do. I stopped using Comcast a few months ago, but before that, I had a Comcast box with HDMI for about a year. Just go to the store and switch it.
I hadn't see this thread until ysterday, only the other HDTV threads and didn't notice the cable talk.
Can I ask which store you went to? I know they basically have what they have so I am wondering which store is more likely to have the box I need.