Get the knee mill, you deserve it. They are so much nicer than a benchtop mill, in so many ways.
My opinion on brands: Bridgeport makes fantastic machines, but they haven't made very many of them in the last 40-50 years. More capable CNC machines replaced them in machine shops, so th eused market is very well used. Finding a Bridgeport that isn't completely clapped out is possible, but not always easy. It also depends on where you live, and if there was a manufacturing base there.
I searched for a mill for a long time in my area. The Bridgeports were expensive, and usually had step pulleys for speed changes. Did I say they were stupidly expensive? I also had the "if it's no US made it's chi-com crap" attitude. Fortunately, I realized that's an ignorant opinion when it comes to old tools. About the time that Bridgeport's production numbers dropped, imports from China and Taiwan started to increase. Some of those machines are pure garbage, but many of them are really good machines.
Keep your eyes open for a 90's Taiwan machine.