Most resolving solid state amp you've ever heard?

My vote also goes to Pass X-250.

Fafafion, thanks for sharing your experience. However those FMAs used, although still very relevant by today's standard, but imo are way too old (almost two decades old design). I think FMAs latest offerings would better reflect their advances (current sound), hence more appropriate when compared to more recent releases of flagship gears such as the Soul700s.

Belles 350A,ref, with audience PC, best amp in your price braket,period:

The amps that come my mind are the: Spectral, Tact and perhaps Spectron. I haven't had the opprotunity to hear enough of it to make a real determination, but the TacT is the only one I would personally consider.