Is 68k asm still really important for dev? In the pc/console market the compilers are so good its extremely unlikely that you can write better asm than the compiler can generate.
I havnt had to use any asm since I wrote ttx for the gp2x and that was minimal!
Never done Amiga dev but tempted! However i sort of imagined a toolchain setup on pc to compile c for Amiga and uae for testing builds. No idea what is actually involved