About a year ago, I asked the same question and got most of the same answers. I chased down every one of the suggestions and found that most of the products were no longer being sold, much less supported.
The remaining few didn't seem to be audiophile-worthy for my modest system ($19K T+A electronics & Harbeth speakers), so I gave up on the idea and redesigned my entire speaker topology. That worked and it may have been a big PITA at the time, but I'm much happier with having gone that way today. I think if I'd installed one of what I'd consider "good enough for now" boxes, it would always be my weakest link.
Yeah, I know, YMMV, but that was my specific experience.
PS: @vthokie83 's recommendation for a bespoke solution also sounds like a good idea if SQ is your absolute highest priority. +1 to that!