I used to own a GFA-555. It was very nice for the money, but the Bryston gear is in an entirely different league, sonically. (I owned a 14BSST for years and have auditioned a couple of all-Bryston systems.) I for one would go for the B135, and I can't imagine you would be disappointed.
I can’t comment on the Krell item, not having heard any Krell gear for over a decade.
HTH
I can’t comment on the Krell item, not having heard any Krell gear for over a decade.
HTH