I never had an amithlon machine but I hope to someday.
On Aros, I have never found a machine where everything works without using specific cards purchased on ebay just for aros - nvidia fx550 video card, intel 100 networkcard and sblive with emu10k chip, and everything works fine.
"Best x86 solution so far is Windows + WinUAE and then loading WinUAE as a shell replacement. No driver problems."
Yes I agree, this works great and no driver problems at all. It helps alot to have a good accelerated video card that works good in windows. I had a machine like this for awhile that was great fun, and booted straight to amiga os3.x
The kxlight install works great too, but I was never able to fix that it would only support 800x600, you need to boot from a linux floppy or something and change the settings on the linux side to allow greater screen resolutions.