The TL-1 is one of the best transports I have ever heard. It seems to combine smoothness with detail in a way that I have not heard from any other transports except CEC. The BelCanto dac should be an excellent match for the TL-1. I have not heard Plinius stuff, so can't comment on the electronics to speaker match. The Sonus though, are awesome speakers in my opinion, and I know they like POWER. I would think the Plinius 250 should be handling them quite nicely. Getting back to the digital, I have had excellent results with Black Diamond tweaks on both transports and DACs.