Check into the ZOTAC Z-Box. The power consumption is pretty decent compared to a full Micro ATX or ITX. It has optical and HDMI audio. Wireless N... I'm running

Check into the ZOTAC Z-Box. The power consumption is pretty decent compared to a full Micro ATX or ITX. It has optical and HDMI audio. Wireless N... I'm running OpenElec on mine and it's very responsive.