This is a thread with a lot of very good suggestions. The Volti speakers seem to tick most boxes, including the right looks. Their cabinets are superb. Although plain looking, the Audi Note speakers should be in the running, particularly if you desire placing the speakers close to the back and side walls. I like Tekton, Devore and ProAc speakers a lot too; all can be used with modestly powered tube amps.
While they may not fit your looks profile, PureAudioProject speakers sound fantastic—large and immersive sound field, alive and engaging, and well balanced tonally (not the deepest bass, but decent for open baffle speakers. They do bedt with a lot of room behind them.
I find Vandersteens do a good job in almost all aspects, but sound just a bit too blah in dynamics (not lively).