"volume control for direct to amp and the most natural sound"
depending on the gain structure of your system, this may or may not work for you. i tried going amp direct with two highly regarded DACs and found the required level of attenuation was simply too much. in my system, an analog preamp was a substantial improvement.
no support for 192k and no headphone output were not requirements for me, so i went with the metrum octave. it's the best dac i've ever owned - and i've been through a few, up to 6x the cost of the metrum.
depending on the gain structure of your system, this may or may not work for you. i tried going amp direct with two highly regarded DACs and found the required level of attenuation was simply too much. in my system, an analog preamp was a substantial improvement.
no support for 192k and no headphone output were not requirements for me, so i went with the metrum octave. it's the best dac i've ever owned - and i've been through a few, up to 6x the cost of the metrum.