The EC version would suit me fine...
but has anyone ever thought of using a CPU32 such as 68360? They are fully compatible with 68000 and with most of the 68020 instruction set, plus a number of extra special features, I don't know if they could be made use of or not.
Also the Coldfire seems to implement more and more of the 68k instruction set with every version, maybe in a few years they will become a viable option. And at 266MHz, that would be quite exciting.