Candy,
You should be okay with the radio(s) that you currently have. They are going to consolidate programing from both XM and Sirius and play the same channels on both satellites. So when the FCC finally approves the merger, you'll be getting some old Sirius channels on your XM radio (like Howard Stern, NFL Football, etc.) and some old XM channels on your current Sirius radios (like Opie and Anthony, MLB, etc.) Being the programming will be the same on both satellites, you won't have to buy any new equipment. However, new equipment coming out will be able to receive both satellites after the merger is approved. You should see any difference, other than some different channels on your current radio...eventually, they are talking about going ala carte and you pick the package, similar to DirecTV, on what you want to listen too.