If *I* had $250K to spend on an audio system, I *wouldn't*. The Law of Diminishing Returns. Once you get past a certain point, you're just throwing money at something and (especially once you hit age 40) you would strain to hear any difference.
I'd take the remaining amount (still well into 6 figures) and build a proper home theater. With that kind of budget, I could even afford one of those 4K systems that's just coming out now.