I currently have a comcast motorola 6412 PVR. I am considering going to Dishnetwork to get more HD channels. Has anyone compared the HD picture quality of the new 622PVR with with a motorola 6412 PVR. I have read that Dish re-compresses their HD channels and it is my understanding that the cable companies do not. Just wondering if the HD picture quality will drop if I go to Dishnetwork.