I am looking at these. They are cheap and if the specs are true, efficent.
http://www.mini-box.com/DC-DC
I am not using a real HDD. I am using a 2GB flash drive with Puppy Linux as an OS. There are no IDE devices attached. I am using a SY-5EHM as my main board
Link to board specs.
http://stason.org/TULARC/pc/motherbo...m-SY-5EHM.html
Link to manual
http://dl.owneriq.net/6/621f097a-73d...38daa2a9dc.pdf