Well, there is Cloanto's
Amiga Forever 6.0. Check it out. It's most likely better than the version you currently have.
Amithlon/AmigaXL, ah, I'll let someone else tackle that mess.
AROS (Amiga Research Operating System)
You can get it from
http://www.aros.org also stop by
http://www.aros-exec.org (AROS Community Site)
There is no native implimentation of Amiga OS on PC X86 architecture. Exept for AROS, which is an Open Source ground up compatable rewrite.