I'm looking to make room for my parents by switching to a smaller form factor mobo/case. I have them running an old school setup with a KT133 based system that uses PC133 RAM. It works plenty fine for them (with an OC'd XP1600+ AGOIA!) and I don't see any need to upgrade anything else. I can't remember what the small form factors were back then that would still use an ATX PSU. My parents see those new SFF machines and really like the small size...