I second the recommendation on the Rockport Mira - was one of the three best rooms I heard at THE show in LA when I was there. It looks like an unassuming speaker and doesn't draw attention to itself - quite tasteful looking. Sonically, it is so capable and balanced in every way. It would probably be my choice in a sub $20k speaker.
Because of your strange room shape/size, investing in a room equalizer like the Copland, Rives or Parc would probably be a good way to allocate your budget, rather than spend it all on speakers.
Because of your strange room shape/size, investing in a room equalizer like the Copland, Rives or Parc would probably be a good way to allocate your budget, rather than spend it all on speakers.