@Red
The prometheus is a great board for OS4 classic. It allows you to use a Voodoo 3 graphics card with 16MB video memory - really helps! Not to mention that you can see the Amiga Early Startup Screen with it, too, after OS4 kickstart loads, so no need for a 15Khz monitor for that!
You can use a PCI Realtek 8029 network card ...

I am using it right now with that configuration and it works well! Highly recommended!