If room is tight then you likely have already accepted that the size of items you work on is OK to be limited as well. That being the case you would likely find a 7x14 mini lathe suits you just fine. And then pair it up with one of the two smaller mills and suitable tooling for vises and such. To save room you can justify the mill for use as a drill press as well. Larger drill bits may prove to be too long but you can cut them off and re-sharpen then down to "stub drills" that do fit. Put a small bench grinder over on the other side of the room to avoid the wheel grit getting on the machines and you'd be all set. A small but sturdy bench with a good bench vise and you'd be all set to do a surprising variety of hobby gunsmithing and making mechanical widgets.
Engineer, if you know you'll be stuck with the Taig and one of those mini mills for at least a few years then either one would be a good match to the Taig you have. And it is likely that you would get back a good portion of the cost anyway. Also since it's an R-8 spindle the collets and tooling you buy will be usable on a future larger mill.
The brushless motor is no doubt a good way to go but I do agree that you could buy a nice vise, collet set and end mills for that extra $300.
Another thing might be the noise level. The motors on those mills are simply not that large. Yet the specs say it's a 3/4 HP motor on the brushless and a 1/2 HP on the other. Even by inflated Asian specs that's a lot of power for those size housings. So it makes me wonder about the noise level. Is the motor on the lower cost mill a universal high speed motor that's going to howl like a banshee all the time? The extra money for the brushless motor might be more than justified if it's a far more quiet motor. Can you visit a showroom and have them power the two models up for you?
