There is also the MCC 216. Multi Classic computer. Check out some of the reviews on that.
I'd like one. Perfect if you mostly play games.
I got one and it's not that great, I can't even get WB to run. I would say it runs 50-60% of the games.
If it was an open source box, it could have potential, I mean, the hardware is there, but it just needs better firmware.
Back on topic:
To be honest, It's not going to happen. Is $20000 enough? It's better to invest in portable AROS or MorphOS.
I think most of us would be very happy to upgrade our Amigas to a faster processor. I'm not talking 68030s anymore, I'm talking ColdFire CPUs with a library emulating missing instructions. Most applications would benefit greatly from the upgrade.
My 2c.