Music channel comparison (non-video)

[AlmostLeft]

We'll be moving in less than a month. We currently have Dish Network but will need to make a choice for the new home. As someone who has subscribed to XM Radio since 2003, I noticed quite a difference in sound quality between listening to the Delphi feed into my receiver and the Sirius(ly reduced playlist) channels off the Dish (supposedly 192 kbps). The sound from the Dish is better than I can get off the internet (128 kbps at best) for other music feeds . I also notice the other music channels on Dish don't sound quite so good ( much less stereo seperation if not actually mono). How good are sound quality, stereo seperation, bandwidth, and playlist depth for my new options which include Time-Warner Cable, DirecTV and ATT U-Verse (apparently Verizon-FIOS is not yet available in my area)?