That will work for the scaler.I was thinking this for the scaler http://www.powerstream.com/dda.htm. I plan on installing a power inverter but don't want to have to have it running all the time. Any ideas for the dock???
Since you need both 12v and 5v output, I'd think you would be better off with a device that can provide both voltages.
A Carnetix P2140 can do that. So can the Opus 80w unit.
If you want to hack a bit, a DC-DC ATX PSU can be put into a dummy mode and provide both 5vDC and 12vDC, as these are standard voltages used by every PC.