I'm guessing that first config has no MMU, so that's out. As for the mediator, I wouldn't expect it to be supported, but you get to choose between 68k and PPC there. It will be some work to get it setup, no idea how much experience you have already. I guess for Linux you have Debian and Gentoo to try, NetBSD could work (amigappc is still in early stages, but has seen some work recently).
