Sirius car kit?

I own the S50 and love it. There's a new S100 as well - it's totally portable, comes with antenna for catching live satellite feeds on-the-go.

I can't recommend the S100 since I've never tried it out, but the S50 is a fantastic little unit which can also be used as a portable .mp3 player, in addition to it being able to be used when connected to your PC.