I dont know what i would do personally but i'd love to see a nice classic Amiga based motherboard that can be put in a standard ATX case.
The specs i'd like to see would be:
Basic 68030 CPU + AGA Chipset with:
Optional or standard G4 CPU (obviously compliant with OS4)
A socket for a 68040 or 68060 CPU
Can address DDR2/3 Ram as fast ram with sockets
Has built in a Picasso96 compliant graphics card which shares memory
Built in USB and Ethernet ports
Built in Sata
PCI Slots
Maybe a floppy drive port which can use normal 1.44MB PC drives as 1.76mb Amiga
That is pretty much Arcade FPGA =)
68030 + AGA = Pretty much there (actually it is faster than a real one)
DDR2/3 RAM = Not really needed
Picasso96 = I read somewhere that it will eventually be included in FPGA (correct me if wrong)
USB + Network = Yes, on the addon expansion
Sata = Not needed (but if you really must, you can use a SATA HDD connected to the USB
PCI Slots = not so far
Floppy drive = no, but you can use .adf files