Wow this is a tough one, these are all good speakers here is my take as someone who knows all of these speakers:
1: Tad Evolution is a good speaker transparent not particularily great in the bass good sound stage never was blown away by the TADs includigng the big models.
2: YG in all the shows we have heard them they tend to sound okay most of the time, we did the New York Audio show in 2012 with the big Kef Blades on an all Chord setup about $125k worth of gear and heard the $107 Sonja setup on all Solution a $400k setup and came away with the Kef Blades at $32k sounded just as good, here the Sonja's did sound very good, heard an old Kipod demo with dual Krells years ago and that demo they did sound very good.
In comparison to the other speakers The YG are not as transparent. We heard the $25k 2 way model at the last New York audio show and was not impressed at all. You have to hear them for yourself.
3: Magicos are a love hate speaker, they are very well made, have good bass but not super deep, good sound staging, to my ear they are sterile and lack musicallity, but others love em.
Personally I would take a Focal Sopra over these, as well as used Rockport. I would also recommend that you listen to the new Persona 5f very transparent, very holographic, with surprisingly deep bass, nice size and nice looking.
Sometimes buying new will get you a better sound for less or the same money as buying a used expensive speaker.
As a Kef Blade dealer I do think we are biased. Howver, they are really amazing when setup with good equipment, your Pass and Briscati stuff are good, I would ditch the Parasoud preamp it is okay it is not a great preamp no matter what the reviews say, we had a full Halo reference setup with JC 2 and JC 1 monos, Electrocompaniet gear sounded way better for not much more money. We have a demo set of Blades with cosmetic damage at the same price as a pair of Blade 2 if you are interested. Damage is one scratch and the speakers need a new base.
Look for a BAT VK 52 or a used Pass preamp, if you want a great sounding preamp a bit more tuby Cary SLP 98. Personally we much prefer a tube front end with a solid state amplifier.
Another option for you would be to listen to these speakers at a dealer with the proviso that you would purchase a dealer demo if they have one, you would be surprised how many dealers might have a slightly dinged up product that they would sell for the same price or nearly the same price at what many people sell used products for and you would get a full warranty and the service and support of a good dealer.
Dave owner
Audio Doctor NJ