$750,000? I'd never spend it on a set of speakers, even if I could afford to. I'd rather build a $500,000 home with a dedicated listening room (9x15x24) and then put about $50,000 into a 2 channel system: Cyrus CDt-XR with PSU-XR feeding into a Chord Dave feeding into a pair of ATC SCM100ASLT speakers. A new home, probably the most ass kicking stereo anyone you know has ever heard, and you still have $200,000 in you pocket. Vacation???