Bridgeports are out there, in good condition, for 3k and under. a guy just has to be at the right place at the right time.
as to the 3 phase motor, i have converted several to single phase motors. it's not that hard to do. there are also phase converters a guy can use as well.
my preference is apparent, as that is what i used every day at work. i also prefer digital read outs, and i worked to the two ten thousandths tolerance most of the time.
with that said, an off shore brand most likely will do what a tinkering around hobbyist needs done.
be advised, however, to look the machine over very closely. just because it seems like a good deal dollar wise, make sure you can get repair parts. i have seen guys destroy machinery simply because they don't know what they are doing.
be wary if there are gouge marks in the hold down slots. the ways can be gacked up easily by running the right cutter into them. these marks can also damage the spindle as well.
a dial indicator will be your best friend when buying a used mill or lathe.
just my opinion from a 45 year machinist career, and still practicing to this day. your mileage will vary.