Floorstanding loudspeakers sit directly on the floor and provide full-range bass and dynamics. The very highest performance is generally two excellent floorstanding loudspeakers with good electronics behind them. These systems provide it all - the midrange, imaging, vocals, while also bringing realism through perfectly integrated bass and dynamics.
When building a performance stereo it's good to allocate a large percentage of your budget to the best performing floorstanding loudspeakers you can afford. Full sized speakers have less need for subwoofers and will do more for defining the character, sound and dynamics of your system than any other factor.