-if you are upgrading systems within 4-6 months, don't bother updating the video in the Beige G3, it ain't that bad with the stock video but you will notice it.
-Mac OS X supports the onboard video but gives little to no openGL/3D acceleration.
-PCI GeForce cards will not work in Beige G3s.
-if you could find a cheap Rage128 based [Orion/Nexus] card would be good, a Radeon is not worth it with PCI you do not get the performance of the AGP version and the price is the same. Check <a href="http://www.barefeats.com
</a> for comparisons between PCI and AGP performance.
-I buy most of mine from Other World Computing. The address is <a href="http://www.owcomputing.com
</a> and they have a memory finder that will show you the different DIMMs that are compatible with Beige G3s, they take standard PC66, 100, and 133 but you have to watch the RAM DIMMs density [size of the chips on the DIMM to make sure it is not too high].
-256MB DIMMs are just under $30. Not sure about 512MB DIMMs, but Beige G3s do not actually support 512MB DIMMs due to the density issue. You can max it out at 768MB regardless of if its a desktop or tower as long as the DIMMs are not over 1.15" high.
Anything else you need to know just post, I have done a lot to Beige G3s with a lot of success.