lol@guru
To start with, I prefer my horns big. I don't like their smaller brethren.
For example, I love the Trios with bass horns, and duos not at all. Same for Tune Audio Anima.
Now, to answer your question, let me first out the disclaimer that each of those 3 brands is incredibly different, and should not be clubbed from an evaluation perspective. Each one needs to be heard, much easier to buy a box speaker or a planar blind.
The AG trios are the best in imaging, scaling, bass, dynamics, if you like orchestral music. They also have optional DSP you can turn on for room issues. You need a minimum 4.5m width, and 6m room. The bigger the room the better they sound. Can sound great with a plain oppo and cheap amp and cables. Certainly on my list of dream purchases.
Acapella Violon/Violoncellos which fit into that price have a nice midrange with their plasma tweeters. If one is listening to amplified vocals, this might be a better choice. The plasma tweeters need servicing every couple of years so buy if you have a DIY guy or support centre around you that can help with that. Fit better into smaller rooms. Show up at large discounts used though
Cessaros - you will struggle to get anything other than the Chopin at that price, and there is one model between that and the Liszt. Purite Audio is selling his Chopin cheap. For smaller rooms. The Liszt, on the other hand, requires a lot of room, and like Acapella, is known for it's midrange, but with different drivers. The TADs are compression drivers that project sound more outwards. The 400k or so Cessaro at Munich had bass horns but at Liszt level and below you don't get a bass horn.
Of these, I would personally would go only for the Trios with the bass horns.