I have been trying to gather parts for a dedicated Windows 98 SE machine for old games for some time, but I had set the project aside. Some of these freebies sound perfect. I'll add some stuff here too, I've got some parts lying around.
dr_bowtie - That socket A proc and mobo sounds pretty good. I had previous tried my Nvidia FX 5700 on a socket A Via board, but there was some incompatibility with the AGP slot not being the Universal AGP 3.0 or something along those lines.. it was a year ago. Are those Biostar boards new enough to nurture an FX card?
What board did you try it on? I ran my FX 5700 Ultra on a VIA board for years without problems. Still have the board actually, but the card I sold to a friend long ago.