I've been using 256MB RAM from my Radeon using the 9.6 pci.library. I've picked up two Radeon 9200's both identical that allow me to do it.
I've had the Voodoo 5 5500 for awhile now, going by prices will hold on to it. Of course you are better off buying through Amibay, Ebay is known for inflated prices.
The issue with the Voodoo 5 is that you can only use one GPU, so the other just sits there idle. However you can clock the Voodoo 5 higher, which helps when playing Quake or Quake2. Smooth as silk. :-)
Duke 3d runs a lot better with the Voodoo 5 too, I've tested it with the Voodoo 3 and I can't get the same performance. Plus with the Voodoo 5 supports higher WB resolutions. 1080p WB is something to see, combined with AFA OS and zune promoter nice :-)
My only gripe is no Warp3D support for the Radeon 9200, otherwise I'd probably remove the Voodoo. Although it does look good having a full length card in the case :-)
Version 10 of the pci.library works fine under OS3.9 but doesn't show any real benefit.