Why not horns?

Unsound, you are definitely mistaken - many, if not most of the greatest symphonic recordings of the "golden age" were monitored with horns. To name the most famous example, the Mercury people most often used Altec A7's, driven by MacIntosh electronics. A great many orchestral musicians are of the opinion that horns come the closest to recreating the sound of a live orchestra. Electrostats come close as well, but do not have the dynamic range of horns in either extreme. I also agree with Atmasphere and Johnk that horns can image as well or better than any other type, something which indeed is very important for classical music.

Here's a quote from Ralph Karsten of Atma Sphere that you can find on page 2 of this thread. If you are concerned about my lifting it out of context, you can read the entire comment there.
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So when I say I prefer the horns I do, its over mbls, Wilsons, Sound Labs, Quads, Magnaplanars, Appogees (and their current clones, which are quite good), Avalons, Dalis and many other excellent speakers too numerous to mention. Further, I don't expect horns to always be on top; all technologies improve and one has to be ready to pick up and move if you want to stay on top :)
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If I had a pair of Magnepans, I would make sure I lived near a beach with big waves, so I could use them as surf boards.
LOL.

FWIW:
http://www.gearslutz.com/board/high-end/500728-monitors-used-classical-music-studios.html

Weseixas since you say you've heard owned or have had much experience with the worlds greatest loudspeakers. Could you let me know brands of horns that you feel represented the best examples that you took the time to demo? You state [my decision is based on hearing the best of the best,] So lets hear it what are the best of the best?