I have no experience with McCormack but have heard almost all positive opinions.
My point in responding would be to suggest, if you go the Bryston route, to consider a used 3B SST ( I really don't think you would need a 4 B SST ).
After considerable experience with both the ST and SST series, it is my opinion( and I believe an almost universally held one ) that the SST series is a smoother, more refined, version. IMO, definitely worth the extra cost.
Also the Bryston offers the option ( a switch on the back ) of changing its input sensitivity between 1 or 2 volts so as to better match other components- a very nice feature.