Aurel, I own these speakers, although my version is about 14 years old. I've heard many good speakers over my years in the hobby - Vandersteens, Thiels, Apogees, Dunlavys, Kefs, Martin Logans, Wilsons, and on and on. The bottom line is that I still own the Diapasons and would not trade them for the world. My listening tastes are very wide: jazz, classical (symphonic and ensemble), vocal, rock, even country (although not much). There may be some speakers that do certain things better than the Diapasons, but I have not run across any in its price range that can do everything as well as it does. Soundstaging, frequency extremes, the texture of the music, clarity, speed. I could say all these things but the real thing about them is that they provide among the most enjoyable musical experiences I've ever heard from a system.
I'm not sure of the 2006 cost. I know that in EU Shahinians are available in high end audio stores (unlike in the USA). If you wanted a USA price on these you would probably have to contact Shahinian direct.
BTW, they are a great match with Plinius amps.