@ dougel:
If you want to network your A4000 then seriously consider a Deneb USB card, it's what I use on mine.
The Deneb will give you 3 USB 2.0 ports (more with an off the shelf hub) and then you can connect a cheap PC USB Ethernet dongle (I use a Trendnet TU2-ET100) for less than $20 and use the Genesis TCP/IP stack that came with OS3.9. Plus you'll be able to do a lot of expanding outside of the case (external drives HD & CD/DVD, memory sticks, card readers, floppy drives, printers, etc).
Couple that with the Indivision and you'll be surfing the net in no time. However I also have a Cybervision 643D card which gives me a nippy RTG display.