If it were me, I'd do (essentially) a new bard's tale, but made for AGA and the 68030, with a complete new story and larger world.
I really liked Hybris also though.
If you want that, you may as well start porting BTBuilder, since the engine is pretty much done, but it's still using the BTCS and that was only for the PC/Amiga. I'm still procrastinating on doing animations, cos we don't have an editor, but the coder is working on it.
Here's a link:
http://www.identicalsoftware.com/btbuilder/
