A Prometheus PCI board is a third of the price of a Mediator, will give Voodoo gfx card and NIC, but requires a deft hand at fitting in a closed A3000 (ya got to use flexible PCI connectors). A Mediator while giving Radeon 9200 speeds can also give fast ram on an OS3.X system, sound, and 100 MB/s NIC (+expensive USB).
I like the Retina BLT Z3 board in the Zorro area.