Ok here we go
I have a xp PC and a vista laptop plus a few other pcs that are not setup

I want to be able to set up different zones in the house. Bedroom1, 2, 3, hall, livingroom, etc. I also want to be able to control what music is played by any computer on my network through any zone. I am going to do this wireless as my network is wireless. I am also going to get a dedicated PC to store all my music on or a network harddrive connected to the router

So basically I want to know what software to get to do this and what type of speakers can I get that allow you to add on at a later date as I dont want to cash out all at once.