Portable XM or Portable Sirius?

well I actually work for xm as tier 2 technical support and as for the sound quality on our portable units, if you want to improve the quality we have a set of headphones that improves reception even more and also improves sound. also as a heads up we are releasing a brand new portable unit from audiovox and its promising to be a very good unit. also, some headphones that people use can alter the sound to where it will sound like an am radio. I have a pioneer inno myself and as long as i dont use cheap headphones it comes through sounding great. Right now xm has a revolutionary type of radio in development (and you didn't hear this from me...) called HDradio. (can you say surround sound radio?) :)