More $? I don't see that. They are both even unless you decide to go 3 or 4 years with XM but when you get to 5 years and compare that to lifetime Sirius, then Sirius is cheaper.
XM current subscribers were given the chance to upgrade to yearly deals when they raised there prices, but if you didn't do that your paying the same.
XM:
Monthly - 1 radio-$12. 95, 2-5 Radios-$6. 99 ea.
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Sports: MLB, NHL, College Sports (3 conferences), and Nascar until 2007.
Sirius:
Monthly - 1 radio-$12. 95, 2-4 Radios-$6. 99 ea.
1 Year - you pay for 11 months and get one month free ($142. 45)
2 Year - you pay for only 21 months and get three months free($271. 95).
Lifetime - $499. 99
Sports:
NFL, NBA, NCAA March Madness, College Sports (5 conferences), English Soccer, Horse Racing, NHL until 2007, and Nascar starts in 2007.