As a Marantz PM-15S2 owner myself, the great thing I have found about Marantz reference series integrateds is that they stop the dreaded upgrade spiral. At least for me.
I would say your PMS3 would be a good match as you move up the Focal ladder to Electras.
I would say your PMS3 would be a good match as you move up the Focal ladder to Electras.