If you are planning such a thing you might be looking at it the wrong way round.
Try this: http://www.synology.com/products/product.p...DS112j&lang=enu
Its a tiny linux box, you just put in a hard drive and go. Uses 35W of power flat out, is small, cool and quiet. That's your server taken care of.
Then, use these clients: http://www.wdc.com/en/products/products.aspx?id=330
<< use the latest embedded N version. Proper HD support and a remote control that works as well for about $100-00.
If you have a wireless N network which you should if your planning to stream, theres the glue for putting it all together.
Way cheaper and more reliable that messing about with Win home server and so on and it just works. And one server and client all up under $400-00 brand new I expect and about $100-00 for each additional client depending on prices in your area.