Barbell bars for home use
One bar and a set of plates will let you lift heavier at home than any machine in the same footprint. Squats, deadlifts, bench press and rows all run on the same piece of steel, and you expand by buying plates instead of another machine. It barely takes any room either: the bar stands vertically in a corner and the plates sit on a rack.
These are the bars that stay usable in a house, together with the sets that come as bar, plates and collars in one. Such a set is usually the practical starting point, because the bore of the plates is then guaranteed to match the sleeve. What decides the choice: the width of your room or rack, the load you eventually want to lift, and whether the bar is allowed to be visible in a living room.
Read more about barbell bars for home use below.