I think that you would have to look at what is the best imaging speaker/amp combination. I have a pair of dynaudio special 25's and Verity Audio Parsifals and they both image very well. Hook them up with VTL tube amps and triode and it is amazing. Very deep, holographic and wide, really makes feel like I am in the sound stage. Change to a belles SA-100 and we have detail, "slam", and tighter bass but the "imaging" becomes more two dementional. Just as wide but a lack of depth. I am listening to a Classe ca-2200 right now with the parsifals and it has some of the holographic imaging of the triode vtl but not nearly to the same degree, just as much air, some of the middle of the stage "you are there" but the slam of the belles as well. So the speaker and amp will give you this imaging factor and should be taken together. Per Kthomas, I do agree with the special 25, matched with the vtl st-150 is magic.
