Lo and behold, I am posting from my Lubuntu install, after laziness, procrastination, and I went with the machine with the faster CPU, but 100Mbit ethernet and 2GB RAM limit.
Comedy of errors included.
1) Copy ISO to USB stick.... but old PC doesn't allow you to choose USB as a bootable drive (I TODAY found out that some older PCs have to have the USB inserted, then the BIOS might see it as a hard drive)
2) Burn ISO to CD-R, with verify option. Set BIOS to boot first from DVD drive. System insists a bootable disc isn't there.
3) Burn ISO to another (different brand) CD-R. Do not verify. This one works.
I went with default everything... and I am SO rusty, I couldn't remember how to do anything with .Xresources (for my XTerms . . jeez, who can read ANYTHING with those default font sizes?!?), and needed to look up how to set font sizes, color, etc with it.
I was also baffled that the initial user I put in actually is the root user without being called "root" -
Ho'boy, do I have a lot to learn, and a lot to re-learn.