I'm going through the same process right now (see my threads on the subject of which speakers to try), and it seems that placing a high emphasis on soundstage is channeling the recommendations in favor of nearfield monitors. Right now I have floorstanders (Linn Ninkas) and they're plenty agile without any noticeable box resonance, but they don't through quite as convincing a stage as I'd like.
This having been said, the best soundstage I ever heard in my whole life was from a pair of Hales Signature IIs, which might also be the largest (and most expensive) speakers I've ever personally auditioned. So I'm not sure that the hard and fast rules about all of this are quite so hard or fast as they may seem.
This having been said, the best soundstage I ever heard in my whole life was from a pair of Hales Signature IIs, which might also be the largest (and most expensive) speakers I've ever personally auditioned. So I'm not sure that the hard and fast rules about all of this are quite so hard or fast as they may seem.