Nice thread - proper imaging and soundstaging is an extremely high priority for me, as I am a professional orchestral musician. I believe a recording engineer should try to recreate the sound of the orchestra in the hall as well as possible, but most of them do not actually even attempt to do this anymore in this digital age. And I should also point out that the "imaging" of live music may sound very different depending on where you are sitting in the hall. Sitting as close as row D would not be the best perspective in most halls. To grossly generalize, sound travels up and back through the hall, so in a great hall, very often the best seats are towards the back and higher up in the hall, though maybe not the nosebleeds. In many of the great sounding orchestral recordings made before the digital era, this is where the mikes were placed. Even Mercury, which usually placed them above the orchestra instead of out in the hall, placed them at least a good 15 feet higher than the orchestra, and often higher yet. You almost never see recording engineers placing mikes anywhere near the back of the hall anymore, or that high either. And when they place different mikes on every section, or even on every individual instrument, on separate tracks, and then mix all of it together later, almost always this results in a complete loss of the sense of the original space, and there is nothing any playback system can do to remedy this - Humpty-Dumpty is broken, and you can't put him back together.
All of that said, though, I also whole-heartedly agree with those who said that the performance is the main thing - a recording can have incredible sonics, but if I strongly dislike the performance, I'm not going to pull it out very often. One should be able to enjoy a great performance, even if it wasn't recorded very well, or is played back on a mediocre system. OK, I'm done rambling for tonight. Goodnight, and enjoy the music!