We don't need Ralph's help with this.
And I agree that an FPGA 68K core may be an attractive option. As would a different PPC processor (the Phase5 card uses a relatively slow one - a 603e isn't it?)
604e in the Cyberstorm, 603e in the Blizzards.
For a new board:
FPGA for 68K (to boot the system and run OS 3.9)
PPC SoC like the CPU in the SAM 460
RAM on-board
SATA on-board
Video on-board (if you can fit it like Sam 460)
USB and LAN on-board
Basically a computer on a cpu card.
Then i would buy it ;-)