I tried the Bryston 4B3 with my 3.7i's. It was not particularly good. I had a Pass XA-25. It was not able to adequately drive the Maggies and did not sound good with them. I acquired a Gryphon Diablo 120 which did an excellent job. But, my AGD Audions do the best of any of these by a considerable margin.
I would expect that a Pass 250.8 would do a great job, but I have not heard it.
You will probably need to audition for yourself.