Timberman, I share your concerns for how speakers will sound in "real world" environments. I'm amazed at audio reviewers who rave about the imaging, etc., as long as they keep their head within the sweet spot area of about 1 cubic foot.
So...for you I'd recommend a speaker with wide dispersion, possibly a dipole or Ohm Walsh. With your reflective surfaces, I'd stay with something warm sounding and stay away from anything harsh. A sub will help keep the bass from being lost in the big room, especially for rock. Of the speakers you've listed, I think that the Paradigms would do well. I've had really good luck listening to Totem's that were placed in another room. Somehow they keep the detail in seemingly impossible acoustics without sounding harsh. I'd personally love to try the Totem Winds in a big room like yours. Buy on A'gon and you can always resell.
So...for you I'd recommend a speaker with wide dispersion, possibly a dipole or Ohm Walsh. With your reflective surfaces, I'd stay with something warm sounding and stay away from anything harsh. A sub will help keep the bass from being lost in the big room, especially for rock. Of the speakers you've listed, I think that the Paradigms would do well. I've had really good luck listening to Totem's that were placed in another room. Somehow they keep the detail in seemingly impossible acoustics without sounding harsh. I'd personally love to try the Totem Winds in a big room like yours. Buy on A'gon and you can always resell.