Hi. A good match would be a pair of Thiel 2.3. The plinius has a great neureal signature that will compliment the highs of the thiels. The MIT's also are a good match for the Thiels - see soundstage review of the Thiels and MIT cables. Absolute sound loves these speakers which retail at $3,600.
Speaker suggestions for Plinius, Muse...
Friend of mine is looking for floorstanding speakers (small to medium room)for Sony X7es cd, Muse model II pre-amp, Plinius MK-3 amp, cables MIT balanced 330 pro-line, speaker cable MIT shotgun 750 bi-wire. His Canton Ergo Rc-L, have overpowering bass, for his new smaller house. Price around 4k. Thanks! Music preference: almost everything!