Im very close to broadcasting live music off my server , everyone seems to say use shoutcast but to honest we want to keep our feeds within our domain and allow only users to listen that are users of the site

So what are my options

I have a managed server with 1 and 1 level 3 ( P4 3.06) bandwith unlimited
at the studio we have a big capable pc connected to a 2mb broadband line

Our studio pc is 2.8ghz with 1.5gb or ram win 2k
could we put IIS on it and do something at our end?

whats all our options please