Well decided not to order a new case since I found an appropriate P.S. in the junk bin at work:
Old Athlon components:
Includes video, USB 2.0, sound and Ethernet all on the board. Also uses much less power.
In its new home:
The one add-in card is a video capture card. It is one of two webcams for the Cat Pavilion. So now we have the horsepower, does anyone know of a good video server so can stream live video of Stevie sleeping? Needs to run under Windows XP. and preferably free.