Keep in mind that AOS 4 is still in prerelease form (the third update to be exact) but will be released later this year. MorphOS is available for Pegasos and PPC accelerated AGA chipset Amigas but doesn't have drivers for as many devices as AmigaOS 4 beta for A1200/A4000. There are accelerator boards planned for the A1200/4000 as well as the MicroA1.
