I didn't actually listen to the stuff, are you 100% sure that a Media Center PC is needed? I have read on many occasions that all you would need for video playback is XP SP2 and a copy of Windows Media Connect.
I find it hard to believe that something with the following description isn't going to be all we need.
"Media Connect supports many formats, including Windows Media Audio (WMA), Windows Media Video (WMV), MP3, JPEG, MPEG-1, and more. In addition, a growing number of device manufacturers are supporting Media Connect on a variety of device types, including digital audio receivers, digital media receivers, and connected-DVD players. These devices can also support the playback of protected content from online stores, giving you access to literally hundreds of thousands of songs, all of which can be played through your home network."
I find it hard to believe that something with the following description isn't going to be all we need.
"Media Connect supports many formats, including Windows Media Audio (WMA), Windows Media Video (WMV), MP3, JPEG, MPEG-1, and more. In addition, a growing number of device manufacturers are supporting Media Connect on a variety of device types, including digital audio receivers, digital media receivers, and connected-DVD players. These devices can also support the playback of protected content from online stores, giving you access to literally hundreds of thousands of songs, all of which can be played through your home network."