This is my system, it has a power consumption of about 90 watts and is completly passive cooled and silent. I changed the soundcard from the original setup, because I needed optical output, but the rest is at it is shown in the link above.
We used this system in an earlier project for Mediaportal, but now it is doing it's job as a LinuxMCE Core/Hybrid. We also added two low-power FiireStations (1" and Set-top-box) as MD to our LinuxMCE network.
The goal for us is to describe a complete LinuxMCE setup and publish an article series on our platform, therefore we're trying to integrate as much as we can. See the Cowon Q5 (http://www.netzwelt.de/news/76687-cowon-q5w-im-test-mp3player.html
) and the Razer Mako Boxes (http://www.netzwelt.de/news/76887-cesneuheit-im-test-razer-mako.html
) for example. The Cowon can play all kind of music and video files, it has Wifi and Sound/S-Video Connector. This setup (Cowon+Boxes) is located in the dining room and controlled via IR from the MD in the living room. Power consumption with this setup is very, very low (and it makes a lot of fun to install the whole stuff)...