If you buy a sattelite package you chould also have a reciever with Dolby Prologic, DTS, or Dolby Digital to get the most out of it. Reason is that the centerspeaker chould only give out voices. It does give out some lower frequences, but if you connect this direct to your reciever, it will sound odd!
If you have a reciever with above mentioned coding, you get a much nicer surrounding sound of the music as well. Not only when looking at a movie.
You get the song from the centerspeaker, and the instruments from the 4 + 1 other speakers.
If you really want to go for Highend, you choose DTS or Dolby Digital. But then you need speakers who can handle the Dolby Digital or DTS coding. And it will cost some more ofcourse.
So what you chould have is a Dolby Prologic reciever with separate subwoofer connection. These you can get for a good price now cause of that DTS and Dolby Digital is what most of us "freaks" go for now.