First of all, i'm sure the SAM440 will support OS4, and i'm very positive about that particular board. Just give it time, people! (and i don't mean in a "2 more weeks™" kind of way!).
Second, AROS is a great platform, with great goals. If it would contain a decent 68k emulation layer, like MOS and OS4 does, i would even concider using it. But for now, it's not usable full-time in a desktop/laptop system. Merely a "fun" OS.
And remember, there's always the EFIKA. It will be MOS-powered soon.
For the rest, stop :horse: and enjoy what you already have!
Regards,
Steve