Musicnoise:
When I listen to orchestra music and the peaks are exceeding 100 dB, it's VERY loud, and then moderate to low volumes passages sound unnaturally higher in volume than they should. It sounds like you're looking for a speaker that's dynamic, very neutral, low distortion, and open sounding, with no box stuffiness or coloration. One that will illuminate the room with a linear response both on and off-axis.
Seriously look into the Linkwitz Lab Orion if the budget isn't restricted. Check their website for people willing to allow auditions. If you're anywhere near the Ohio-Indiana-Kentucky area I'd be glad to let you audition both the Orion and the ∏ Audio systems in my home. Let me know.
