The Prometheus is a Great PCI Bridge, especially if you can get it for the 'Right' price.
Running with a Voodoo3, and a 10mbit NIC works flawlessly, never used it on less than an 060/50 though, it's very fast.
Apparently you can use a Terratec 512i soundcard, and also a USB card with the OpenPCI drivers, I once tried a 100mbit NIC but it didn't work.
Robert