I would not look to the MPCNC as a replacement printer, especially if you’re looking for detail and accuracy. It might be capable of fine detail, with a lot of tuning a tweaking (maybe), but it’s certainly not designed for it. You’d almost surely be disappointed.
The Prusa is probably a good bet. You might like the Fabrikator Mini from HobbyKing. Chuck Hellebuyck’s youtube channel has some good info on it. It comes ready to print right out of the box, ships from the US, and last time I looked it was less than $300.
Like Ryan says, an SLA printer is what you really want if want detail in small models. I don’t know what they cost, though.
Good luck with whatever you choose!