Haha, there are different payment plans, but the packages are all the same iirc. I mean they have an internet 'satellite' radio only package (talkin sirius here) then they have the satellite radio package which is pretty much THE package for those with receivers, and that has multiple payment cycle types.
I've definitely noticed that the built in receiver on my car is 10000000x better at picking shit up than the old one I bought, so id do some researching