If you really shop around for several months, there are Bridgeports every once in a while for $800-$1000. Passed here on a almost new baby Bridgeport ($1000.) because didn't want to make a 3000 mile round trip to pick it up. Bridgeports are pretty much bomb proof, they often have 3 phase motors which can be replaced if needed. There are many other used USA mills which are copies of Bridgeports out there, often very reasonable.
Not convinced all imported machines are the same. If you are lucky, some might have a lower cost label on them due to some overrun or dead contract. Convinced from using a few, there are a lot of look alikes, there might be a reason for trying to look like a good machine. There are many classes of bearings in these machines, good and not good. That doesn't say the less expensive won't work for you under limited use or for a shorter machine life.
Bigger is better, more power, more stiffness which gives better accuracy. But, consider the size of what you will be making, why buy a 5 ton truck when a pickup will do.
Have a Jet tabletop here, and it is very accurate, needed no adjusting or rework out of the box and they stock parts. While a table top mill, it has milled some 12" chunks of tall RR track without a problem. Some of the low budget guys don't stock parts beyond a few years, parts are important for an expensive piece of machinery down the road!