Want to hear XM stations on your old Sirius radio, or vice versa? Starting next month, you can—but you'll only get seven specific stations, and you'll have to cough up extra cash for the privilege.

Sirius XM—the new name of the combined XM/Sirius satellite radio service, which won FCC approval in July—says it will launch its "Best of Both" plans starting October 6, for $16.99 a month (about $4 more than the standard $12.95/month subscription).

The service will let those with Sirius radios listen to a package of seven XM Radio stations on their existing Sirius receivers. Got an XM receiver? Then you'll get seven Sirius stations.

So, the details:

"Sirius on XM" stations
Howard 100, Howard 101, Martha Stewart Living Radio, Sirius NFL Radio, Sirius NASCAR Radio, Playboy Radio

"XM on Sirius" stations
NBA, NHL Home Ice, Oprah & Friends, The Virus, Public Radio with Bob Edwards, College Sports, PGA Tour

Overall, it's good news for XM listeners looking for a daily dose of Stern or NFL action, while Sirius users will finally get a crack at pro and college hoops; Martha and Oprah fans will be covered, as well. Missing from the lineup, however, is MLB on XM—although by Oct. 6, the regular season will be over anyway.

Want to pick and choose any combination of XM or Sirius stations? Well, you'll need a new receiver, and according to Sirius XM CEO Mel Karmazin, such dual-mode radios won't be available until next year. Brutal.

So, satellite radio users: Willing to shell out $16.99 a month for a taste of both XM and Sirius? Or will you wait until dual-mode XM/Sirius receivers hit the market?