I used an EVGA 500W ATX Power Supply to power the Wildbot. I was able to break out the 5VSB (standby) and use that to power the Duet. This meant I could power the printer on or off remotely by sending a M80 or M81 command. Though, once I installed the PanelDue touchscreen, I found that it stayed powered all the time, too. To resolve this, I installed a relay between the Duet and the PanelDue that only sent the 5V to the PanelDue when the 12V from the PSU was present.
I put the PSU, SSR, and any 120VAC connections in a metal enclosure that could be grounded, seperate from the Duet and any 12VDC connections. This made it safer for me to tinker with the connections on the Duet when necessary.
You can tell from the picture to the right that I'm a maintenance man, not an electrician. But you know what, wire ducting is stupid. There, I said it.