Ok, I need a media server for playing back high definition video and surround sound audio. I do not store movies on my PC, but I do like to record short snippets like a song on the grammys or something similar that I would like to stream to my Plasma. Right now I use Momitsu, but it has no HD support so I am looking for something else. This is going to be put in a cabinet so there is not a lot of space--PS3 is out due to the heat in the confined space (although I do have an exhaust fan).

Any recommendations?