I do Core + HBO (thinking about canceling ($15/mo)) + sports pack ($10/mo). Sports pack includes red zone, which is perfect because I like to watch that 10am-1pm and then the cards typically in the afternoon. With DTV I was forced to pay for the full sunday ticket to get red zone and I don't want to watch entire games if the cards aren't playing. Sports pack also includes some fringe sports like triathlon and the outdoor channel, so I love it.
Make sure you have a good internet plan with cox. I came close to maxing out my bandwidth a few times.
I miss history channel, but that's about it. My wife misses channel 3 news and my daughter had to give up Nickelodeon I think. Other than that, we get all the channels we used to watch.
The DVR blows away DTV. That's all I really use. Anything you want to watch, just set to record. No limits except it's only available for 28 days (unless it's on demand).
I don't really watch network tv, but I think channel 12 is the normal channel. I'll take a look though next time I'm watching tv.