The PSB Synchrony Two Tower is practically tailor-made to your parameters other than that it is floorstanding. However, it is a small tower which would disappear into your music room--7.6"x11" footprint and only 39" tall. That's a smaller footprint and overall space intrusion than just about any stand-mounted speaker up to the task. The Synchrony Two sensitivity is rated at 88dB anechoic, 90 dB with room gain, and a claimed -1.5 dB at 36 Hz and a lower cutoff of 29 Hz.
List price is $3500/pair, but
Crutchfield has them on sale at $2798/pair with free shipping.
Although this is not an exotic solution like the boutique models previously mentioned, PSB has the advantage of vertical integration (they make their own drivers) and economy of scale to deliver high value at a lower cost. PSBs are characteristically clean, linear, and dynamic with a particularly natural and transparent-sounding midrange.
PSB has a lot of respect in the high end press and among high end vendors. My local
PSB dealer also features Wilson, D'Agostino, Magnepan, Vienna, Audio Research, Ayre, and Transparent.
Rave reviews abound for this speaker, including
TAS, which designated it the best PSB speaker they'd reviewed to date.