The days people begged you to buy their B&W G3 for $10 are over, most have been recycled by now. If you are going to save a B&W then the rev 2 is the one to keep (just like people liked last revision ROM Beige G3's). These days you also have the same issue with G4 AGP Sawtooths where the later revisions that allow for dual processors are much more valuable then the earlier revisions.

You can still find some good deals, recently a guy in California was giving away a few machines one of which was a B&W G3 with a 1Ghz upgrade processor but he would not ship. There are some decent upgrades for a stock unit like the PCI Radeon video cards that work in the 66mhz video slot, G4 ZIF upgrades and fast G3 ZIFs.