I have a pair of Sophias and they were killer with an ARC VT100 Mark III that I used to have. I would think your amp would work well with the Sophias as they are a relatively easy load other than being a nominal 4 ohm impedance. I don't have experience with the other speakers but they are also highly regarded.
Which is the best speaker to buy ?
I currently have the Audio Research LS25 MK2 preamp & the Audio Research 100.2 amp with the denon 3910 universal for my source and totem forests for speakers which I want to upgrade. What would you recommend out of these choices or mabe another, Von Schweikert, Wilson sophia, B&W nautilus or usher?