>>4396007>do some filming for somethingCould you be more specific?
If you *need* heaps of background blur (bokeh) for what you're filming you'd want to get something full frame. These are typically more expensive, so you'd be looking at something like a used Canon 5D mark ii or mark iii, or a Sony a7s ii.
If super shallow DOF isn't something you need, then you would probably get better results out of a crop sensor camera, such as lumix m43, olympus m43 or sony ZV series cameras. The lumix and olympus cameras have pretty good in body sensor stabilisation so they would work better for hand-holding the cameras. The full frame options mentioned earlier will work much better on a tripod.
A lot of this really depends on what you can find a good deal on near you. Best advice is to do some thorough research on the cameras ive mentioned, and similar cameras and then look for whatever you can get for cheap near you.