FWIW, I started looking at the minis, moved on to shopping for a bench top, and then some of the smaller knee mills. Ended up buying a used full size knee mill from a machinery dealer about 3 hours north of me. Haggled the cost of freight (their truck I believe) into the cost. The dropped it off and pushed it into my garage with a pallet jack. I just had to tilt the head 90 to fit through my door.
There are times I wish I had an even bigger milk to be honest, but I couldn’t imagine going smaller.
Bottom line: it is a little more work and logistics to get a larger machine, but you absolutely will not regret it, and it’s a one time headache (unless you plan on moving, though guys do it).
At the end of the day, they really don’t take up a whole lot more space either, at least not much more than a bench top mill.
Something to think about.