Vdosc, the Wilson W/P speakers will produce the goals of your indicated #3 (though I wouldn't call their midrange liquid). However, they will fail in your #2 category above. For your size room, they would be a good pairing with this amp assuming you listen at "reasonable" sound levels - though still loud.
I have owned Wilson (Currently), B&W (formerly) and Martin Logan (Quests I believe and Aerius, both formerly). Of these, the Wilson and ML's will deliver the best soundstage, imaging, etc. . . But I understand your feeling about the bass/panel integration seeming a bit like a powered sub.
Other considerations (based on my ownership):
Thiel - great at #3, but not enough power.
Totem - very good at #3, pretty accomodating for #2 and depending on model safe with this amp (try Forrest or Hawks)
VS VR4JR - pretty good with your amp, somewhat accomodating (but need space behind) for placement, pretty solid overall for your #3 - but the bass can get sloppy based on placement
Gemme Katana (or other models) - very good with your amp, quite accomodating in terms of placement, very good for your #3 category (with the notation that the sound stage is more behind the speakers than in front of them). But these would be a good match with your amp
I owned B&W's in the past, but to be honest, I grew bored with their characteristics (not that they are bad, just not what I was seeking).
But again, any speaker is limited in its performance based on the phsyical room it is contained. You cannot get tight/accurate bass and good imaging in an acoustically bad room!
