If you have CAD and are reasonably skilled it may be worth doing a space diagram to verify that the mill you intend to buy actually has enough room to easily handle the jobs you propose to do.
Continually working around insufficient space is a truly miserable experience.
I got rid of my first two mills, a BCA and large size square column import, and went up to a Bridgeport purely for space reasons. The square column mill was largely equal to the Bridgeport in stiffness and machining capacity but it simply lacked space to easily handle the work I ended up doing
Which ended up rather different than I originally planned! Turned out I’m not a model maker. Happy being Home Shop Guy working in 12 inch to the foot scale.
As David Halford mentioned above the gotcha with a mill is that everything has to fit inside the work envelope so once you’ve added work holding underneath and tooling stick out on top the actual room for the job is a lot less. Don’t underestimate setting up space. Much easier if you can crank things sideways enough so you don’t have to work under the head. Probably the thing that really confirmed that I had to go up to a Bridgeport form my short table square column one where setting up had to be done under the head rather than out to one side then crank back.
Tilting heads need a decently long table if they are to be regularly useful. With a short table by the time you have the job mounted up and allowed for the tool stick out the useful angle of tilt can be severely restricted because the table can’t go far enough sideways. In practice about 10° or 15° maximum on my short table square column one without risky levels of creativity in work holding. Flipping the thing right over to horizontal is the province of big, by home shop standards, brutes like Bridgeport and Beavers et al and even then there isn’t much space.
Fixed heads, hopefully with more vertical lift and short drills to give room for a tilting work holder are best for smaller machines. Pity it’s hard to find comprehensive sets of short drills. For model making purposes you don’t need the length of conventional jobber drills above around 1/4″ 6 mm (ish). I reckon it’s pretty rare for model makers using bench top sized mills to drill more than 2″ / 50 mm deep using the mill.
Rather than splash out on a brand new machine far better to find a decent used example to get your feet wet without risking a huge loss if the choice turns out to be the wrong one for you. Generally decent used mill prices are pretty static so you will get back pretty much what you paid. Just be out collection and installation costs. Worth it to get a much better idea of what you actually want as opposed to what you thought you wanted.
But I would say that ‘cos it was third time right for me. (well near enough I still prefer a Beaver or TS but I haven’t the ceiling height).
Clive