Why not have both?

Even if I ever get a new Amiga
I'll still keep my old hardware.
And the price of a PPC for the 4000 is still less than the
A-1 overall, because he can just buy the card and drop it in,
as opposed to buying a case and video cards and drives...
Not to mention the use of his toaster...
Overall a Cyberstorm would still be roughly 1/3 the cost of an
A-1 system.