The Plinius is more natural sounding, with a better midrange and great dynamics. It also has more power, 150wpc to 60wpc?. You will have more choices when you buy or change seakers. I have owned the Plinius and a Sim W5. For the $$$, the Plinius can't be beat. Used, should be about $1600 or $1700 for an 8100.