I have DTV DH, only 10 channels. I hope they add more HD. Looks like DN has more HD but also you pay more. It cost me $10 extra to get 10 HD channels. I love it, especially the Discovery HD. ABC, NBC and CBS are HD too, so you can watch NHL, NBA, NFL and soccer on weekends in HD. World cup soccer was amazing in HD. Good luck.
I had DN not too long ago. And I cancelled it after 6 months, paid penalty for early termination. I now have DTV, I love it. I had never "down time" with DTV. Unlike DN, every so often, you'll get an error message on your screen, that is because they are "updating" their receivers via satellite/stream. I had 3 different DN receivers, and they all do the same thing, drives me crazy.