A good compromise would be the stand mount Reference 3A de Capos. 8.25 in woofer/mid 92db sens
The PSB Imagine X2T towers seem made-to-order for your situation. They're $1298/pair, reasonably sensitive, have fairly wide, room-filling dispersion, and deep, strong, fast bass, a necessity for energizing large listening spaces.
Crutchfield's user reviews are very favorable, and some make a point of how well they work in large spaces and how deep and driving the bass goes.
They're also an Absolute Sound GoldenEar choice.
The Absolute Sound
I sold audio equipment in Sansui's heyday, along with Marantz, Yamaha's first wave, Kenwood, and Hitachi. The current BEE series from NAD is worlds better, and for your listening area size and musical tastes, 150w stable into 4 ohms is the way to go.
Also, a tower speaker with a modest footprint (such as the suggested PSB tower) takes no more space than a smaller speaker on a stand. The tower has advantages in sensitivity, dynamics, and bass fullness and extension. Even among floorstanders in its size and price class, the Imagine XT2 tower has deeper bass extension.