I decided to take the plunge into the MiSTer FPGA project, and ordered a build it yourself kit from LegacyPixels.com. I chose this seller because he sells both assembled and unassembled kits, with the unassembled ones being heavily discounted.
I ordered the Terasic DE10-Nano from Mouser, and, everything arrived today. The most critical part of the system, it seems, is the USB hub, because without it, you can't interact with the Nano due to having no way to connect a keyboard. The Nano has one micro-USB port on it, and I don't have a keyboard that has anything other than a standard USB connector on it. So I soldered up the USB hub today, in all it's 0806 glory, and proceeded to prepare the SD card for the OS per the Wiki on the MiSTer GitHub page. Since I can now connect a keyboard, I had it update the system and start, I assume, downloading the cores(?). It's been running this task for quite some time now, so hopefully in a little while, I'll be able to check it out and see what seemingly everyone who has one is raving about.
I'll build the I/O board and the SDRAM board, and maybe the RTC tomorrow. Once it's all done, I am thinking I might put it into a spare A1200 case and build myself a keyboard for it, from Grey Unicorn's github (since AOTL will likely never get their act together with that Kipper2K keyboard -- what a shame), then connect it via a Keyrah.
I love stuff like this....