I am a fellow Mahler fan, and bruckner (have you heard any of the Chelibidache recordings on EMI yet?)
I love my audio physic virgos for it. They may not be dark enough sounding for some people's taste, but I love being able to see the crystal clear image. Some people find the image distracting for classical music, but I find that it helps me notice the monumental efforts of specific musicians or thier sections. I love the way Mahler throws the motifs around between sections, and this speaker really demonstrates that.
I don't like electrostatic for classical. That's my taste though. While they convey a clear and airy sound they never seem to demonstrate the sense of power that the musicians are capable of creating.
I'm pretty happy with my MF a3 integrated. It seems to really do well with the lower strings. I love the way the celli sound when they are sawing away! (they would definitly take that as an insult.....)