You're ideas are at the opposite end of the spectrum from mine. Loudspeakers have the toughest job in the audio system being transducers (changing energy from one form, electrical, into mechanical) and working in unknown environments, so I see the amps as serving the loudspeakers, not the other way around, and should be selected with that in mind.
The leading-edge research done by Floyd Toole, Earl Geddes, and others indicate that inherent in-room bass peaks/dips (30 dB not being uncommon) are best dealt with via multiple subwoofers. Bass is best produced in corners or midway along the primary walls, opposite for midrange/treble frequencies, thus another plus for the use of subwoofers.
I'm a single driver and active monitor fan. (In my opinion single driver designs are active by default.) The use of a single channel of amplification per driver has several important advantages over passive loudspeakers. In the case of active monitors the designer can better pick the best amp for each driver and the low voltage crossover is far more sophisticated than letting the consumer hunt for a "matching" amp and living with compromised crossovers. BTW the Bryston actives are a clumsy and very expensive solution that tries to sell off the shelf amps. Reminds me of a first phase lab experiment.
The best auditioning are done in rooms similar to your's, taking your time, using music you're familiar with, taking notes to combat fleeting aural memory, and limiting yourself to no more than four auditions per day to avoid aural fatigue.
Good luck on your search.