Simply plugging in my welder caused a power glitch in the middle of routing a PC Board - the glitch caused the computer to re-boot. I was not happy. I decided to purchase a Uninterpretable Power Supply from APC. It only provides 10 minutes of backup - but that's plenty to make it through the occasional power glitch and even the careless tripping over the power cord. I have both my CPU and monitor powered via the UPS. The mongo power supply for the Steppers can ride through powerline glitches with ease.
I also isolation-routed another PCB, this one a simple linear-regulated 12VDC power supply to drive the case fans. I was much more comfortable with Eagle CAD this time around. I set up the raw PCB, hit "GO" and came back 45 minutes later to have it all perfectly done. Sweet!