You have a very nice start with the Totem and Plinius. I have been using a PS Audio Digital Link III and am a big fan. It has a smooth and realistic presentation with good full range extension and tames the digital glare. The mods are even better they say. I also bought a Cambridge DAC Magic for a secondary system and it is really good, but not like the PS Audio. Used for $500, I think the DLIII is a great deal. If you can spend more, there are clearly better units, of course. The next step up may be the Wyred 4 Sound for $999, but I haven't heard it. Many out there as you approach $1K. We are all lucky to have so many great DACs at all price points.