Streaming audio across my home network

[Jaundice]

I've been playing around with streaming for a while now, I have my ps3 media server set up and running smoothly.. but we have many parties here at the house, and I am in charge of the music and playlists every time... and I have a simple question that I just can't figure out how to phrase so I'll break it down:

My computer is upstairs

I have itunes set up with all the playlists

I wanna be able to use the Itunes DJ function (everyone has iphones to vote and control music)

when we use itunes to stream to our speakers downstairs, we have to use my roomates itunes to access my library, which only gives the iphone control to one person, who only can control previous and next and pause and whatnot



so what can I do to stream my computers audio to my roommates, so the sound coming out of our speakers is what is heard on my computer?

I wanna use Itunes because of all the playlists and iphone implementation