Good points from Arthur. I'd add my own generalization about the two different routes: Floorstanders certainly lend a fullness in the low end that monitors will fall short on. If the floorstander is a 3-way (or more), vs. a 2-way monitor, where I've found the monitor excels is in creating a more laser-focused image of instruments/vocalists in space whereas the multi-way floorstanders tend to diffuse that image slightly. It is not as much a matter of sound staging (width/depth), but one of focus. Monitors seem to be champs at both disappearing and at creating a very convincing soundstage, though I've heard some floorstanders that are pretty damn good. I think both designs well-implemented can do a great job creating a soundstage, but the fewer and closer the drivers, and the fewer the crossover points, it seems to me the more focused and sharp (lifelike, if it occurs to you that way) the images themselves become. This is one of the ways single-driver and concentric driver speakers excel, where the full range of sound is coming from a single point (or a single point on each side). Again, this is a generalization based upon my personal experiences over the years. I like what each route has to offer. I've not done much listening with subs, so can't comment much there, other than integrating them into system and room is ever so critical.
Marco
Marco