I think IcAros rocks but Amithlon has WarpOS support.
Now that would be an miracle to say the least, since WarpOS is PPC and Amithon only does 68k (and to some extent x86).
Amithlon does run 68k-apps that don't require the chipset, and it does at speed unrivaled by anything on the same HW. Problem is it has been pulled from the market in 2002 and support for never HW dried up some time later.
AROS only runs x86 and the number of AROS-apps is limited. 68k-SW does run in a somewhat intregrated UAE but it's also slower/less developed than WinUAE.
Honestly, cut down WinXP and run WinUAE just as if AmigaOS was the only OS running.
