Plinius or Mark Levinson for Grand Pianos?

Which one will yield better results with the Sonus Faber Grand Piano Concerto, the Plinius SA-100 MKIII or the Mark Levinson No. 27?

Currently running ARC D130 and found it lacked power to drive the GP's. Looking for more a more detailed and dynamic sound. I personally lean towards the Plinius but was afraid the 100W wouldn't be too sufficient to drive the GP's to optimum since the 130W ARC D130 didn't have the power either.

Any comments appreciated.