Listened to the the PS audio and Benchmark before choosing the PS. The Benchmark is bright and older versions are very bright in comparison.
Have heard the Music Hall but not the Cambridge. The Music Hall did nothing to change my opinion on the PS. A little lacking in detail.
My other suggestion would be to wait for the new Wyred DAC that I heard at RMAF. Around $1200 with the new Sabre DAC 9008 installed. Very smooth, detailed and dynamic.