Interesting post.
check out
http://www.fozzebear.com it gives a good overview of Sirius.
Programing is much better on Sirius in my humble opinion. I've owned the sat radio since 2/04 and the programming on Sirius is much better. We have XM in our SUV and pretty much all the generation channels suck.... ie the 80s.
Don't forget Howard Stern is coming to Sirius as well and they have NFL, NHL (when they play) and no premium charge for Opi and Anthony or the Playboy Channel..... I've always wondered why someone would want the Playboy Channel on radio....... I guess there's just not enough oportunity to masturbate...
Fozz