Thanks for all the suggestions. But please be advised, my goal is to spend as little as possible. Even a great deal on a $349 new PC is not in my interest at this point. I have no justification for buying this. I have a work laptop I bring home to my home network so this would be used as a toy (mostly surfing).
I only need the PC. I don't need a monitor, printer, keyboard or mouse. I'm willing to go $100, but would probably pass if I had to invest over $150. I would upgrade the RAM if necessary, but wouldn't add a CD burner or bigger drive (my dead computer running XP had a 30 GB drive and it was nearly full, but I used it for 4 years).
But keep the comments coming. I live for your collective knowledge.