Alot of good suggestions here....BUT....the one I think gives you a sound of Real Music beyond the speakers themselves is the LAB 12 Integra 4....highly recommended. Good luck in your search...There's lots out there. I also second Audia Flight.
Tube amps under $7500
Ready to experiment with combinations never before (or not recently) tried. Step one requires a tube amp. Now looking at Prima Luna EVO 400 which sells for 5K. Any other tube amps I should consider in this price/feature range? Must come in silver with balanced input. For pairing experimentally with various tube and SS preamps. Efficient 4 ohm Legacy speakers (and the room/setup) are the constants.