JDW, I'm not knocking Jameco or their parts, I'm just saying they might not have the most extensive selection in this area. There might be a shop that has what we are looking for off-the-shelf we are not aware of.
techknight, when you mention borrow techniques from the auto industry do you mean using something like this (12V DC noise filter):
Are there off-the-shelf solutions with Pi-filters, etc?
Maybe someone would be able to determine if the CRT sweep can influence the noise level significantly of a common 12V rail (and other rails?) for a "modern" PSU... What tools would be needed, an oscilloscope?
Another page on PSU/ATX hacking (Japanese): http://take103.blog.fc2.com/blog-entry-22.html