A:
Over time I have used several 'auto' XM systems. I have also tried one of the 'boombox' types.
All of these had similar problems, namely small screens and very small buttons/controls.
I wouldn't recommend them for your application. I suggest you check out the Sirius/XM site
for 'Home' XM systems (or possibly Crutchfield). They have a couple that look like they have larger controls.
They look more like stand alone radios. I'm not sure about how they might interface with an AV system.