Get a Pegasus II, it will run circles around any classic accelerated Amiga and it runs both MOS and AOS4. For classic stuff keep your A1200 or A4000 and upgrade them as needed for games/demos, though 060 for demos will be quite expensive.
That's a valid opinion.
Further, if you do want to run an NG Os on your PPC equipped Amiga, I'd recommend AOS4.
MorphOS for those machines is no longer being developed.
And a Mac makes a better MorphOS machine anyway. It cheaper and much faster.