Well, at the moment people can only buy either ACA500 or Kipper's RAM+IDE board.
FPGA cards are the future, but there's still some time till they become a complete package.
So... a 020 board for A500 would be a good filler
And now, with Kipper's newly acquired connectors, A1200 cards are a possibility too
I mean, who wouldn't love to have a 33MHz 020 with FPU !
A500s and A1200s are a much better target audience