I own an E55o with Merlin VSM, and it is close to the performance of my Berning ZH270 and Prototype-Pre, which says a lot, the latter being one of the classic speaker-amp combinations. Depending on your power requirements, you might prefer the Class A Accuphase 550?
And - I you havent done so, I might be interested in your Nagra gear ;-)
And - I you havent done so, I might be interested in your Nagra gear ;-)