Since you're the one telling people they really want that Mac emulation board, can I ask you again why?
Because it was the thing to have, not just for the coolness factor or the utility of being able to run MacOS (and faster than it would run on the Mac, too) but because it added more I/O including some highly credible serial ports. You're going to use your serial port for a MIDI interface, right? Given that nearly all you need is some level-shifting hardware, since it has a 31,250bps mode? And if you have two Amigas, which is not unlikely since you might well want one with the old chipset and one with the new, your parallel port is likely to be used for PLIP. It's actually fairly speedy. Then you only need one egregiously expensive ethernet card.
I mean, if you're not messing with the Amiga to recapture the past, then what are you doing? Most of the classic games run in emulators, and there's really no point to using the hardware any more except as an affectation. It would be fun perhaps to use the Amiga in a nerdy stage show, but there's no point to trying to do "real work" with it. It's an amusement.