Hi there
I'm not sure you need the Home Server to do this

For Audio there's ZILLIONS of ways to stream content everywhere even from a humble laptop so an ordinary desktop PC with loads of Disk space -- no probs (plus you get direct access to loads of nice Internet stations as well that you can stream wirelessly all over your house.

I use the Logitech Squeezebox system

Transporter® & Squeezebox™ Wireless Network Music Players - Every room deserves a soundtrack

Works on Linux as well which if you just want a server is probably the best option.

For Video there are also loads of options as well

my favorite is the SLINGBOX system --

Sling Media - Home of the Slingbox


Cheers
jimbo